初始化上传

.gitattributes

@@ -0,0 +1,11 @@
+#
+# https://help.github.com/articles/dealing-with-line-endings/
+#
+# Linux start script should use lf
+/gradlew        text eol=lf
+
+# These are Windows script files and should use crlf
+*.bat           text eol=crlf
+
+/build/
+/.gradle/

.github/workflows/build.yml

@@ -0,0 +1,30 @@
+# Automatically build the project and run any configured tests for every push
+# and submitted pull request. This can help catch issues that only occur on
+# certain platforms or Java versions, and provides a first line of defence
+# against bad commits.
+
+name: build
+on: [pull_request, push]
+
+jobs:
+  build:
+    runs-on: ubuntu-24.04
+    steps:
+      - name: checkout repository
+        uses: actions/checkout@v6
+      - name: validate gradle wrapper
+        uses: gradle/actions/wrapper-validation@v6
+      - name: setup jdk
+        uses: actions/setup-java@v5
+        with:
+          java-version: '25'
+          distribution: 'microsoft'
+      - name: make gradle wrapper executable
+        run: chmod +x ./gradlew
+      - name: build
+        run: ./gradlew build
+      - name: capture build artifacts
+        uses: actions/upload-artifact@v7
+        with:
+          name: Artifacts
+          path: build/libs/

.gitignore

@@ -0,0 +1,40 @@
+# gradle
+
+.gradle/
+build/
+out/
+classes/
+
+# eclipse
+
+*.launch
+
+# idea
+
+.idea/
+*.iml
+*.ipr
+*.iws
+
+# vscode
+
+.settings/
+.vscode/
+bin/
+.classpath
+.project
+
+# macos
+
+*.DS_Store
+
+# fabric
+
+run/
+
+# java
+
+hs_err_*.log
+replay_*.log
+*.hprof
+*.jfr

LICENSE

@@ -0,0 +1,121 @@
+Creative Commons Legal Code
+
+CC0 1.0 Universal
+
+    CREATIVE COMMONS CORPORATION IS NOT A LAW FIRM AND DOES NOT PROVIDE
+    LEGAL SERVICES. DISTRIBUTION OF THIS DOCUMENT DOES NOT CREATE AN
+    ATTORNEY-CLIENT RELATIONSHIP. CREATIVE COMMONS PROVIDES THIS
+    INFORMATION ON AN "AS-IS" BASIS. CREATIVE COMMONS MAKES NO WARRANTIES
+    REGARDING THE USE OF THIS DOCUMENT OR THE INFORMATION OR WORKS
+    PROVIDED HEREUNDER, AND DISCLAIMS LIABILITY FOR DAMAGES RESULTING FROM
+    THE USE OF THIS DOCUMENT OR THE INFORMATION OR WORKS PROVIDED
+    HEREUNDER.
+
+Statement of Purpose
+
+The laws of most jurisdictions throughout the world automatically confer
+exclusive Copyright and Related Rights (defined below) upon the creator
+and subsequent owner(s) (each and all, an "owner") of an original work of
+authorship and/or a database (each, a "Work").
+
+Certain owners wish to permanently relinquish those rights to a Work for
+the purpose of contributing to a commons of creative, cultural and
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+works, reuse and redistribute as freely as possible in any form whatsoever
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+These owners may contribute to the Commons to promote the ideal of a free
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+part through the use and efforts of others.
+
+For these and/or other purposes and motivations, and without any
+expectation of additional consideration or compensation, the person
+associating CC0 with a Work (the "Affirmer"), to the extent that he or she
+is an owner of Copyright and Related Rights in the Work, voluntarily
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+Work and the meaning and intended legal effect of CC0 on those rights.
+
+1. Copyright and Related Rights. A Work made available under CC0 may be
+protected by copyright and related or neighboring rights ("Copyright and
+Related Rights"). Copyright and Related Rights include, but are not
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+
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+ vi. database rights (such as those arising under Directive 96/9/EC of the
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+     directive); and
+vii. other similar, equivalent or corresponding rights throughout the
+     world based on applicable law or treaty, and any national
+     implementations thereof.
+
+2. Waiver. To the greatest extent permitted by, but not in contravention
+of, applicable law, Affirmer hereby overtly, fully, permanently,
+irrevocably and unconditionally waives, abandons, and surrenders all of
+Affirmer's Copyright and Related Rights and associated claims and causes
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+future claims and causes of action), in the Work (i) in all territories
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+including without limitation commercial, advertising or promotional
+purposes (the "Waiver"). Affirmer makes the Waiver for the benefit of each
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+successors, fully intending that such Waiver shall not be subject to
+revocation, rescission, cancellation, termination, or any other legal or
+equitable action to disrupt the quiet enjoyment of the Work by the public
+as contemplated by Affirmer's express Statement of Purpose.
+
+3. Public License Fallback. Should any part of the Waiver for any reason
+be judged legally invalid or ineffective under applicable law, then the
+Waiver shall be preserved to the maximum extent permitted taking into
+account Affirmer's express Statement of Purpose. In addition, to the
+extent the Waiver is so judged Affirmer hereby grants to each affected
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+time extensions), (iii) in any current or future medium and for any number
+of copies, and (iv) for any purpose whatsoever, including without
+limitation commercial, advertising or promotional purposes (the
+"License"). The License shall be deemed effective as of the date CC0 was
+applied by Affirmer to the Work. Should any part of the License for any
+reason be judged legally invalid or ineffective under applicable law, such
+partial invalidity or ineffectiveness shall not invalidate the remainder
+of the License, and in such case Affirmer hereby affirms that he or she
+will not (i) exercise any of his or her remaining Copyright and Related
+Rights in the Work or (ii) assert any associated claims and causes of
+action with respect to the Work, in either case contrary to Affirmer's
+express Statement of Purpose.
+
+4. Limitations and Disclaimers.
+
+ a. No trademark or patent rights held by Affirmer are waived, abandoned,
+    surrendered, licensed or otherwise affected by this document.
+ b. Affirmer offers the Work as-is and makes no representations or
+    warranties of any kind concerning the Work, express, implied,
+    statutory or otherwise, including without limitation warranties of
+    title, merchantability, fitness for a particular purpose, non
+    infringement, or the absence of latent or other defects, accuracy, or
+    the present or absence of errors, whether or not discoverable, all to
+    the greatest extent permissible under applicable law.
+ c. Affirmer disclaims responsibility for clearing rights of other persons
+    that may apply to the Work or any use thereof, including without
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+    consents, permissions or other rights required for any use of the
+    Work.
+ d. Affirmer understands and acknowledges that Creative Commons is not a
+    party to this document and has no duty or obligation with respect to
+    this CC0 or use of the Work.

README.md

@@ -0,0 +1,9 @@
+# Cardinal Cooperative Capitalism: Market Economy
+
+## Setup
+
+For setup instructions, please see the [Fabric Documentation page](https://docs.fabricmc.net/develop/getting-started/creating-a-project#setting-up) related to the IDE that you are using.
+
+## License
+
+This template is available under the CC0 license. Feel free to learn from it and incorporate it in your own projects.

TODO

@@ -0,0 +1 @@
+礼物，信，神器，点歌

build.gradle

@@ -0,0 +1,88 @@
+plugins {
+	id 'net.fabricmc.fabric-loom-remap' version "${loom_version}"
+	id 'maven-publish'
+}
+
+version = project.mod_version
+group = project.maven_group
+
+repositories {
+	// Add repositories to retrieve artifacts from in here.
+	// You should only use this when depending on other mods because
+	// Loom adds the essential maven repositories to download Minecraft and libraries from automatically.
+	// See https://docs.gradle.org/current/userguide/declaring_repositories.html
+	// for more information about repositories.
+}
+
+loom {
+	mods {
+		"cardinal-cooperative-capitalism-market-economy" {
+			sourceSet sourceSets.main
+		}
+	}
+}
+
+dependencies {
+	minecraft "com.mojang:minecraft:${project.minecraft_version}"
+	mappings "net.fabricmc:yarn:${project.yarn_mappings}:v2"
+	modImplementation "net.fabricmc:fabric-loader:${project.loader_version}"
+
+	modImplementation "net.fabricmc.fabric-api:fabric-api:${project.fabric_api_version}"
+	
+	implementation("org.xerial:sqlite-jdbc:3.45.1.0")
+	implementation("com.mysql:mysql-connector-j:8.3.0")
+	implementation("com.zaxxer:HikariCP:5.1.0")
+	
+	include("org.xerial:sqlite-jdbc:3.45.1.0")
+	include("com.mysql:mysql-connector-j:8.3.0")
+	include("com.zaxxer:HikariCP:5.1.0")
+}
+
+processResources {
+	def version = project.version
+	inputs.property "version", version
+
+	filesMatching("fabric.mod.json") {
+		expand "version": version
+	}
+}
+
+tasks.withType(JavaCompile).configureEach {
+	it.options.release = 21
+}
+
+java {
+	// Loom will automatically attach sourcesJar to a RemapSourcesJar task and to the "build" task
+	// if it is present.
+	// If you remove this line, sources will not be generated.
+	withSourcesJar()
+
+	sourceCompatibility = JavaVersion.VERSION_21
+	targetCompatibility = JavaVersion.VERSION_21
+}
+
+jar {
+	def projectName = project.name
+	inputs.property "projectName", projectName
+
+	from("LICENSE") {
+		rename { "${it}_$projectName"}
+	}
+}
+
+// configure the maven publication
+publishing {
+	publications {
+		create("mavenJava", MavenPublication) {
+			from components.java
+		}
+	}
+
+	// See https://docs.gradle.org/current/userguide/publishing_maven.html for information on how to set up publishing.
+	repositories {
+		// Add repositories to publish to here.
+		// Notice: This block does NOT have the same function as the block in the top level.
+		// The repositories here will be used for publishing your artifact, not for
+		// retrieving dependencies.
+	}
+}

gradle.properties

@@ -0,0 +1,20 @@
+# Done to increase the memory available to gradle.
+org.gradle.jvmargs=-Xmx1G
+org.gradle.parallel=true
+
+# IntelliJ IDEA is not yet fully compatible with configuration cache, see: https://github.com/FabricMC/fabric-loom/issues/1349
+org.gradle.configuration-cache=false
+
+# Fabric Properties
+# check these on https://fabricmc.net/develop
+minecraft_version=1.21.10
+yarn_mappings=1.21.10+build.3
+loader_version=0.19.2
+loom_version=1.16-SNAPSHOT
+
+# Mod Properties
+mod_version=1.0.0
+maven_group=com.gvsds.tcme
+
+# Dependencies
+fabric_api_version=0.138.4+1.21.10

gradle/init.gradle

@@ -0,0 +1,40 @@
+allprojects {
+    buildscript {
+        repositories {
+            maven {
+                name 'Aliyun'
+                url 'https://maven.aliyun.com/repository/central'
+            }
+            maven {
+                name 'AliyunPublic'
+                url 'https://maven.aliyun.com/repository/public'
+            }
+            maven {
+                name 'Tencent'
+                url 'https://mirrors.cloud.tencent.com/nexus/repository/maven-public/'
+            }
+            mavenCentral()
+            gradlePluginPortal()
+        }
+    }
+    
+    repositories {
+        maven {
+            name 'Aliyun'
+            url 'https://maven.aliyun.com/repository/central'
+        }
+        maven {
+            name 'AliyunPublic'
+            url 'https://maven.aliyun.com/repository/public'
+        }
+        maven {
+            name 'Tencent'
+            url 'https://mirrors.cloud.tencent.com/nexus/repository/maven-public/'
+        }
+        maven {
+            name 'Modrinth'
+            url 'https://api.modrinth.com/maven'
+        }
+        mavenCentral()
+    }
+}

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=file:///D:/%E8%BF%85%E9%9B%B7%E4%B8%8B%E8%BD%BD/gradle-9.4.1-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

@@ -0,0 +1,248 @@
+#!/bin/sh
+
+#
+# Copyright © 2015 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/2d6327017519d23b96af35865dc997fcb544fb40/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -jar "$APP_HOME/gradle/wrapper/gradle-wrapper.jar" \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

gradlew.bat

@@ -0,0 +1,93 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

settings.gradle

@@ -0,0 +1,58 @@
+pluginManagement {
+	repositories {
+		// 阿里云镜像
+		maven {
+			name = 'Aliyun'
+			url = 'https://maven.aliyun.com/repository/central'
+		}
+		maven {
+			name = 'AliyunPublic'
+			url = 'https://maven.aliyun.com/repository/public'
+		}
+		// 腾讯云镜像
+		maven {
+			name = 'Tencent'
+			url = 'https://mirrors.cloud.tencent.com/nexus/repository/maven-public/'
+		}
+		// Fabric 官方源
+		maven {
+			name = 'Fabric'
+			url = 'https://maven.fabricmc.net/'
+		}
+		mavenCentral()
+		gradlePluginPortal()
+	}
+}
+
+dependencyResolutionManagement {
+	repositories {
+		// 阿里云镜像 - 用于通用依赖
+		maven {
+			name = 'Aliyun'
+			url = 'https://maven.aliyun.com/repository/central'
+		}
+		maven {
+			name = 'AliyunPublic'
+			url = 'https://maven.aliyun.com/repository/public'
+		}
+		// 腾讯云镜像
+		maven {
+			name = 'Tencent'
+			url = 'https://mirrors.cloud.tencent.com/nexus/repository/maven-public/'
+		}
+		// Modrinth 镜像 - 用于 Minecraft 模组相关依赖
+		maven {
+			name = 'Modrinth'
+			url = 'https://api.modrinth.com/maven'
+		}
+		// Fabric 官方源 - 用于 Fabric 相关依赖
+		maven {
+			name = 'Fabric'
+			url = 'https://maven.fabricmc.net/'
+		}
+		mavenCentral()
+	}
+}
+
+// Should match your modid
+rootProject.name = 'cardinal-cooperative-capitalism-market-economy'

src/main/java/com/gvsds/tcme/CardinalCooperativeCapitalismMarketEconomy.java

@@ -0,0 +1,124 @@
+package com.gvsds.tcme;
+
+import com.gvsds.tcme.command.CMECommand;
+import com.gvsds.tcme.config.Config;
+import com.gvsds.tcme.config.ConfigManager;
+import com.gvsds.tcme.database.DatabaseManager;
+import com.gvsds.tcme.gui.InputScreenHandler;
+import com.gvsds.tcme.manager.BalanceManager;
+import com.gvsds.tcme.manager.CurrencyManager;
+import com.gvsds.tcme.manager.ExchangeRateManager;
+import com.gvsds.tcme.manager.PaymentRequestManager;
+import com.gvsds.tcme.manager.PlayerSettingsManager;
+import com.gvsds.tcme.manager.TransactionManager;
+import com.gvsds.tcme.i18n.LanguageManager;
+import net.fabricmc.api.ModInitializer;
+import net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents;
+import net.fabricmc.fabric.api.message.v1.ServerMessageEvents;
+import net.minecraft.text.Text;
+import net.minecraft.util.Formatting;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class CardinalCooperativeCapitalismMarketEconomy implements ModInitializer {
+	public static final String MOD_ID = "cardinal-cooperative-capitalism-market-economy";
+
+	public static final Logger LOGGER = LoggerFactory.getLogger(MOD_ID);
+
+	private static ConfigManager configManager;
+	private static DatabaseManager databaseManager;
+	private static CurrencyManager currencyManager;
+	private static BalanceManager balanceManager;
+	private static TransactionManager transactionManager;
+	private static PaymentRequestManager paymentRequestManager;
+	private static PlayerSettingsManager playerSettingsManager;
+	private static LanguageManager languageManager;
+	private static ExchangeRateManager exchangeRateManager;
+
+	@Override
+	public void onInitialize() {
+		LOGGER.info("Initializing Cardinal Cooperative Capitalism: Market Economy");
+
+		configManager = new ConfigManager();
+		LOGGER.info("Configuration loaded successfully");
+
+		CMECommand command = new CMECommand();
+		command.register();
+		LOGGER.info("CME command tree registered via CommandRegistrationCallback");
+
+		ServerLifecycleEvents.SERVER_STARTING.register(server -> {
+			LOGGER.info("Server starting, initializing database and managers...");
+			Config.Database dbConfig = configManager.getConfig().getDatabase();
+			databaseManager = new DatabaseManager(dbConfig);
+			databaseManager.connect();
+
+			if (databaseManager.isConnected()) {
+			boolean isMySQL = "mysql".equalsIgnoreCase(dbConfig.getType());
+			Config.Tables tables = dbConfig.getTables();
+
+			currencyManager = new CurrencyManager(databaseManager, tables);
+			balanceManager = new BalanceManager(databaseManager, tables, isMySQL);
+			transactionManager = new TransactionManager(databaseManager, tables, balanceManager, isMySQL);
+			paymentRequestManager = new PaymentRequestManager(databaseManager, tables, balanceManager, transactionManager, isMySQL);
+			playerSettingsManager = new PlayerSettingsManager(databaseManager, tables, isMySQL);
+			exchangeRateManager = new ExchangeRateManager(databaseManager, tables, isMySQL);
+			languageManager = new LanguageManager(databaseManager, isMySQL);
+
+			CMECommand.setManagers(currencyManager, balanceManager, transactionManager, paymentRequestManager, playerSettingsManager, languageManager, exchangeRateManager);
+			LOGGER.info("Managers initialized and set to CMECommand");
+			}
+		});
+
+		ServerMessageEvents.CHAT_MESSAGE.register((message, sender, params) -> {
+			String text = message.getContent().getString();
+			if (InputScreenHandler.hasSession(sender.getUuid())) {
+				InputScreenHandler.submitInput(sender, text);
+			}
+		});
+
+		ServerLifecycleEvents.SERVER_STOPPING.register(server -> {
+			LOGGER.info("Server stopping, closing database connection...");
+			if (databaseManager != null) {
+				databaseManager.disconnect();
+			}
+		});
+
+		LOGGER.info("Initialization complete!");
+	}
+
+	public static ConfigManager getConfigManager() {
+		return configManager;
+	}
+
+	public static DatabaseManager getDatabaseManager() {
+		return databaseManager;
+	}
+
+	public static CurrencyManager getCurrencyManager() {
+		return currencyManager;
+	}
+
+	public static BalanceManager getBalanceManager() {
+		return balanceManager;
+	}
+
+	public static TransactionManager getTransactionManager() {
+		return transactionManager;
+	}
+
+	public static PaymentRequestManager getPaymentRequestManager() {
+		return paymentRequestManager;
+	}
+
+	public static PlayerSettingsManager getPlayerSettingsManager() {
+		return playerSettingsManager;
+	}
+
+	public static LanguageManager getLanguageManager() {
+		return languageManager;
+	}
+
+	public static ExchangeRateManager getExchangeRateManager() {
+		return exchangeRateManager;
+	}
+}

src/main/java/com/gvsds/tcme/config/Config.java

@@ -0,0 +1,69 @@
+package com.gvsds.tcme.config;
+
+import java.util.List;
+
+public class Config {
+    
+    public static class Tables {
+        private String currencies = "cme_currencies";
+        private String balances = "cme_balances";
+        private String transactions = "cme_transactions";
+        private String paymentRequests = "cme_payment_requests";
+
+        public String getCurrencies() { return currencies; }
+        public void setCurrencies(String currencies) { this.currencies = currencies; }
+
+        public String getBalances() { return balances; }
+        public void setBalances(String balances) { this.balances = balances; }
+
+        public String getTransactions() { return transactions; }
+        public void setTransactions(String transactions) { this.transactions = transactions; }
+
+        public String getPaymentRequests() { return paymentRequests; }
+        public void setPaymentRequests(String paymentRequests) { this.paymentRequests = paymentRequests; }
+    }
+    
+    public static class Database {
+        private String type = "sqlite";
+        private String sqlitePath = "./config/cardinal-economy/database";
+        private String mysqlHost = "localhost";
+        private int mysqlPort = 3306;
+        private String mysqlDatabase = "cardinal_economy";
+        private String mysqlUsername = "root";
+        private String mysqlPassword = "";
+        private boolean useSSL = false;
+        private Tables tables = new Tables();
+        
+        public String getType() { return type; }
+        public void setType(String type) { this.type = type; }
+        
+        public String getSqlitePath() { return sqlitePath; }
+        public void setSqlitePath(String sqlitePath) { this.sqlitePath = sqlitePath; }
+        
+        public String getMysqlHost() { return mysqlHost; }
+        public void setMysqlHost(String mysqlHost) { this.mysqlHost = mysqlHost; }
+        
+        public int getMysqlPort() { return mysqlPort; }
+        public void setMysqlPort(int mysqlPort) { this.mysqlPort = mysqlPort; }
+        
+        public String getMysqlDatabase() { return mysqlDatabase; }
+        public void setMysqlDatabase(String mysqlDatabase) { this.mysqlDatabase = mysqlDatabase; }
+        
+        public String getMysqlUsername() { return mysqlUsername; }
+        public void setMysqlUsername(String mysqlUsername) { this.mysqlUsername = mysqlUsername; }
+        
+        public String getMysqlPassword() { return mysqlPassword; }
+        public void setMysqlPassword(String mysqlPassword) { this.mysqlPassword = mysqlPassword; }
+        
+        public boolean isUseSSL() { return useSSL; }
+        public void setUseSSL(boolean useSSL) { this.useSSL = useSSL; }
+        
+        public Tables getTables() { return tables; }
+        public void setTables(Tables tables) { this.tables = tables; }
+    }
+    
+    private Database database = new Database();
+    
+    public Database getDatabase() { return database; }
+    public void setDatabase(Database database) { this.database = database; }
+}

src/main/java/com/gvsds/tcme/config/ConfigManager.java

@@ -0,0 +1,55 @@
+package com.gvsds.tcme.config;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+public class ConfigManager {
+    
+    private static final Gson GSON = new GsonBuilder().setPrettyPrinting().create();
+    private static final Path CONFIG_DIR = Path.of("config", "cardinal-economy");
+    private static final Path CONFIG_FILE = CONFIG_DIR.resolve("config.json");
+    
+    private Config config;
+    
+    public ConfigManager() {
+        loadConfig();
+    }
+    
+    private void loadConfig() {
+        try {
+            if (!Files.exists(CONFIG_DIR)) {
+                Files.createDirectories(CONFIG_DIR);
+            }
+            
+            if (Files.exists(CONFIG_FILE)) {
+                String json = Files.readString(CONFIG_FILE);
+                config = GSON.fromJson(json, Config.class);
+            } else {
+                config = new Config();
+                saveConfig();
+            }
+        } catch (IOException e) {
+            throw new RuntimeException("Failed to load config", e);
+        }
+    }
+    
+    public void saveConfig() {
+        try {
+            if (!Files.exists(CONFIG_DIR)) {
+                Files.createDirectories(CONFIG_DIR);
+            }
+            String json = GSON.toJson(config);
+            Files.writeString(CONFIG_FILE, json);
+        } catch (IOException e) {
+            throw new RuntimeException("Failed to save config", e);
+        }
+    }
+    
+    public Config getConfig() {
+        return config;
+    }
+}

src/main/java/com/gvsds/tcme/database/DatabaseManager.java

@@ -0,0 +1,187 @@
+package com.gvsds.tcme.database;
+
+import com.gvsds.tcme.CardinalCooperativeCapitalismMarketEconomy;
+import com.gvsds.tcme.config.Config;
+import com.zaxxer.hikari.HikariConfig;
+import com.zaxxer.hikari.HikariDataSource;
+
+import java.sql.Connection;
+import java.sql.SQLException;
+
+public class DatabaseManager {
+
+    private Config.Database dbConfig;
+    private boolean initialized = false;
+    private HikariDataSource dataSource;
+
+    public DatabaseManager(Config.Database dbConfig) {
+        this.dbConfig = dbConfig;
+    }
+
+    public void connect() {
+        try {
+            HikariConfig hikariConfig = new HikariConfig();
+
+            if ("sqlite".equalsIgnoreCase(dbConfig.getType())) {
+                String dbPath = dbConfig.getSqlitePath();
+                java.nio.file.Path path = java.nio.file.Path.of(dbPath);
+                try {
+                    java.nio.file.Files.createDirectories(path);
+                } catch (java.io.IOException e) {
+                    CardinalCooperativeCapitalismMarketEconomy.LOGGER.error("Failed to create SQLite directory", e);
+                }
+                String jdbcUrl = "jdbc:sqlite:" + dbPath + "/cardinal_economy.db";
+                hikariConfig.setJdbcUrl(jdbcUrl);
+                hikariConfig.setDriverClassName("org.sqlite.JDBC");
+                hikariConfig.setMaximumPoolSize(1);
+                hikariConfig.setConnectionTimeout(10000);
+                hikariConfig.setAutoCommit(false);
+            } else if ("mysql".equalsIgnoreCase(dbConfig.getType())) {
+                String jdbcUrl = String.format("jdbc:mysql://%s:%d/%s?useSSL=%s&allowPublicKeyRetrieval=true&serverTimezone=UTC",
+                        dbConfig.getMysqlHost(),
+                        dbConfig.getMysqlPort(),
+                        dbConfig.getMysqlDatabase(),
+                        dbConfig.isUseSSL());
+                hikariConfig.setJdbcUrl(jdbcUrl);
+                hikariConfig.setDriverClassName("com.mysql.cj.jdbc.Driver");
+                hikariConfig.setUsername(dbConfig.getMysqlUsername());
+                hikariConfig.setPassword(dbConfig.getMysqlPassword());
+                hikariConfig.setMaximumPoolSize(10);
+                hikariConfig.setMinimumIdle(2);
+                hikariConfig.setConnectionTimeout(30000);
+                hikariConfig.setIdleTimeout(600000);
+                hikariConfig.setMaxLifetime(1800000);
+                hikariConfig.setAutoCommit(false);
+                hikariConfig.addDataSourceProperty("cachePrepStmts", "true");
+                hikariConfig.addDataSourceProperty("prepStmtCacheSize", "250");
+                hikariConfig.addDataSourceProperty("prepStmtCacheSqlLimit", "2048");
+            } else {
+                CardinalCooperativeCapitalismMarketEconomy.LOGGER.error("Unknown database type: {}", dbConfig.getType());
+                return;
+            }
+
+            hikariConfig.setPoolName("3CME-Pool");
+            this.dataSource = new HikariDataSource(hikariConfig);
+
+            try (Connection testConn = dataSource.getConnection()) {
+                CardinalCooperativeCapitalismMarketEconomy.LOGGER.info("Successfully connected to {} database (HikariCP pool initialized)", dbConfig.getType());
+            }
+
+            initialized = true;
+            initializeTables();
+        } catch (SQLException e) {
+            CardinalCooperativeCapitalismMarketEconomy.LOGGER.error("Failed to connect to database", e);
+        }
+    }
+
+    private String getJdbcUrl(Config.Database dbConfig) {
+        if ("sqlite".equalsIgnoreCase(dbConfig.getType())) {
+            String dbPath = dbConfig.getSqlitePath();
+            return "jdbc:sqlite:" + dbPath + "/cardinal_economy.db";
+        } else if ("mysql".equalsIgnoreCase(dbConfig.getType())) {
+            return String.format("jdbc:mysql://%s:%d/%s?useSSL=%s&allowPublicKeyRetrieval=true&serverTimezone=UTC",
+                    dbConfig.getMysqlHost(),
+                    dbConfig.getMysqlPort(),
+                    dbConfig.getMysqlDatabase(),
+                    dbConfig.isUseSSL());
+        }
+        return "";
+    }
+
+    private void initializeTables() {
+        try (Connection conn = getConnection()) {
+            try (var statement = conn.createStatement()) {
+                String dbType = dbConfig.getType();
+                boolean isMySQL = "mysql".equalsIgnoreCase(dbType);
+
+                String uuidType = isMySQL ? "BINARY(16)" : "BLOB";
+                String textType = isMySQL ? "VARCHAR(255)" : "TEXT";
+                String autoIncrement = isMySQL ? "AUTO_INCREMENT" : "AUTOINCREMENT";
+                String currentTimestamp = isMySQL ? "CURRENT_TIMESTAMP" : "CURRENT_TIMESTAMP";
+                String engineClause = isMySQL ? "ENGINE=InnoDB DEFAULT CHARSET=utf8mb4" : "";
+
+                String currenciesTable = String.format("""
+                    CREATE TABLE IF NOT EXISTS %s (
+                        id INTEGER PRIMARY KEY %s,
+                        name %s NOT NULL UNIQUE,
+                        symbol %s NOT NULL,
+                        tradable INTEGER DEFAULT 1,
+                        created_at TIMESTAMP DEFAULT %s
+                    ) %s
+                    """, dbConfig.getTables().getCurrencies(), autoIncrement, textType, textType, currentTimestamp, engineClause);
+
+                String balancesTable = String.format("""
+                    CREATE TABLE IF NOT EXISTS %s (
+                        id INTEGER PRIMARY KEY %s,
+                        user_uuid %s NOT NULL,
+                        currency_id INTEGER NOT NULL,
+                        balance REAL DEFAULT 0.0,
+                        created_at TIMESTAMP DEFAULT %s,
+                        updated_at TIMESTAMP DEFAULT %s,
+                        FOREIGN KEY (currency_id) REFERENCES %s(id),
+                        UNIQUE(user_uuid, currency_id)
+                    ) %s
+                    """, dbConfig.getTables().getBalances(), autoIncrement, uuidType, currentTimestamp, currentTimestamp,
+                    dbConfig.getTables().getCurrencies(), engineClause);
+
+                String transactionsTable = String.format("""
+                    CREATE TABLE IF NOT EXISTS %s (
+                        id INTEGER PRIMARY KEY %s,
+                        from_uuid %s,
+                        to_uuid %s,
+                        currency_id INTEGER NOT NULL,
+                        amount REAL NOT NULL,
+                        type %s NOT NULL,
+                        description %s,
+                        created_at TIMESTAMP DEFAULT %s,
+                        FOREIGN KEY (currency_id) REFERENCES %s(id)
+                    ) %s
+                    """, dbConfig.getTables().getTransactions(), autoIncrement, uuidType, uuidType,
+                    textType, textType, currentTimestamp, dbConfig.getTables().getCurrencies(), engineClause);
+
+                String paymentRequestsTable = String.format("""
+                    CREATE TABLE IF NOT EXISTS %s (
+                        id INTEGER PRIMARY KEY %s,
+                        from_uuid %s NOT NULL,
+                        to_uuid %s NOT NULL,
+                        currency_id INTEGER NOT NULL,
+                        amount REAL NOT NULL,
+                        status %s DEFAULT 'pending',
+                        created_at TIMESTAMP DEFAULT %s,
+                        FOREIGN KEY (currency_id) REFERENCES %s(id)
+                    ) %s
+                    """, dbConfig.getTables().getPaymentRequests(), autoIncrement, uuidType, uuidType,
+                    textType, currentTimestamp, dbConfig.getTables().getCurrencies(), engineClause);
+
+                statement.execute(currenciesTable);
+                statement.execute(balancesTable);
+                statement.execute(transactionsTable);
+                statement.execute(paymentRequestsTable);
+
+                conn.commit();
+                CardinalCooperativeCapitalismMarketEconomy.LOGGER.info("Database tables initialized");
+            }
+        } catch (SQLException e) {
+            CardinalCooperativeCapitalismMarketEconomy.LOGGER.error("Failed to initialize database tables", e);
+        }
+    }
+
+    public Connection getConnection() throws SQLException {
+        Connection conn = dataSource.getConnection();
+        conn.setAutoCommit(false);
+        return conn;
+    }
+
+    public void disconnect() {
+        initialized = false;
+        if (dataSource != null && !dataSource.isClosed()) {
+            dataSource.close();
+            CardinalCooperativeCapitalismMarketEconomy.LOGGER.info("HikariCP datasource closed");
+        }
+        CardinalCooperativeCapitalismMarketEconomy.LOGGER.info("Database manager disconnected");
+    }
+
+    public boolean isConnected() {
+        return initialized && dataSource != null && !dataSource.isClosed();
+    }
+}

src/main/java/com/gvsds/tcme/gui/AlertScreenHandler.java

@@ -0,0 +1,106 @@
+package com.gvsds.tcme.gui;
+
+import com.gvsds.tcme.util.TextUtil;
+import net.minecraft.component.DataComponentTypes;
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.entity.player.PlayerInventory;
+import net.minecraft.item.ItemStack;
+import net.minecraft.item.Items;
+import net.minecraft.network.packet.s2c.play.CloseScreenS2CPacket;
+import net.minecraft.network.packet.s2c.play.ScreenHandlerSlotUpdateS2CPacket;
+import net.minecraft.screen.ScreenHandler;
+import net.minecraft.screen.ScreenHandlerType;
+import net.minecraft.screen.slot.Slot;
+import net.minecraft.screen.slot.SlotActionType;
+import net.minecraft.server.network.ServerPlayerEntity;
+import net.minecraft.text.Text;
+
+import java.util.function.Consumer;
+
+public class AlertScreenHandler extends ScreenHandler {
+    private final GuiInventory inventory;
+    private final Consumer<Boolean> callback;
+    private boolean closed = false;
+
+    public AlertScreenHandler(int syncId, PlayerInventory playerInventory, String message, Consumer<Boolean> onClose) {
+        super(ScreenHandlerType.GENERIC_9X3, syncId);
+        this.callback = onClose;
+        this.inventory = new GuiInventory(27);
+
+        for (int row = 0; row < 3; ++row) {
+            for (int col = 0; col < 9; ++col) {
+                this.addSlot(new Slot(this.inventory, col + row * 9, 8 + col * 18, 18 + row * 18) {
+                    @Override
+                    public boolean canInsert(ItemStack stack) {
+                        return false;
+                    }
+
+                    @Override
+                    public boolean canTakeItems(PlayerEntity playerEntity) {
+                        return false;
+                    }
+                });
+            }
+        }
+
+        ItemStack infoItem = new ItemStack(Items.PAPER);
+        infoItem.set(DataComponentTypes.CUSTOM_NAME, TextUtil.parseFormatting(message));
+        inventory.setSlot(13, infoItem);
+
+        ItemStack closeItem = new ItemStack(Items.RED_WOOL);
+        closeItem.set(DataComponentTypes.CUSTOM_NAME, Text.literal("[ Close ]").formatted(net.minecraft.util.Formatting.RED));
+        inventory.setSlot(22, closeItem);
+
+        for (int i = 0; i < 9; i++) {
+            this.addSlot(new Slot(playerInventory, i, 8 + i * 18, 142));
+        }
+    }
+
+    @Override
+    public ItemStack quickMove(PlayerEntity player, int index) {
+        return ItemStack.EMPTY;
+    }
+
+    @Override
+    public boolean canUse(PlayerEntity player) {
+        return true;
+    }
+
+    private void closeGui(PlayerEntity player) {
+        if (closed) return;
+        closed = true;
+        if (player instanceof ServerPlayerEntity serverPlayer) {
+            serverPlayer.networkHandler.sendPacket(new CloseScreenS2CPacket(this.syncId));
+        }
+    }
+
+    @Override
+    public void onSlotClick(int slotIndex, int button, SlotActionType actionType, PlayerEntity player) {
+        if (closed) return;
+
+        if (slotIndex == 22 && actionType == SlotActionType.PICKUP) {
+            closeGui(player);
+            if (callback != null) callback.accept(true);
+            return;
+        }
+
+        if (slotIndex >= 0 && slotIndex < 27 && actionType == SlotActionType.PICKUP) {
+            closeGui(player);
+            if (callback != null) callback.accept(true);
+            return;
+        }
+
+        if (player instanceof ServerPlayerEntity sp) {
+            sp.networkHandler.sendPacket(new ScreenHandlerSlotUpdateS2CPacket(this.syncId, 0, slotIndex, this.getSlot(slotIndex).getStack()));
+        }
+    }
+
+    @Override
+    public void onClosed(PlayerEntity player) {
+        if (!closed) {
+            closed = true;
+            if (callback != null) callback.accept(true);
+        }
+        super.onClosed(player);
+    }
+}

src/main/java/com/gvsds/tcme/gui/ConfirmScreenHandler.java

@@ -0,0 +1,117 @@
+package com.gvsds.tcme.gui;
+
+import com.gvsds.tcme.util.TextUtil;
+import net.minecraft.component.DataComponentTypes;
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.entity.player.PlayerInventory;
+import net.minecraft.item.ItemStack;
+import net.minecraft.item.Items;
+import net.minecraft.network.packet.s2c.play.CloseScreenS2CPacket;
+import net.minecraft.network.packet.s2c.play.ScreenHandlerSlotUpdateS2CPacket;
+import net.minecraft.screen.ScreenHandler;
+import net.minecraft.screen.ScreenHandlerType;
+import net.minecraft.screen.slot.Slot;
+import net.minecraft.screen.slot.SlotActionType;
+import net.minecraft.server.network.ServerPlayerEntity;
+import net.minecraft.text.Text;
+import net.minecraft.util.Formatting;
+
+import java.util.function.Consumer;
+
+public class ConfirmScreenHandler extends ScreenHandler {
+    private final GuiInventory inventory;
+    private final Consumer<Boolean> callback;
+    private boolean responded = false;
+
+    public ConfirmScreenHandler(int syncId, PlayerInventory playerInventory, String message, Consumer<Boolean> onConfirm) {
+        super(ScreenHandlerType.GENERIC_9X3, syncId);
+        this.callback = onConfirm;
+        this.inventory = new GuiInventory(27);
+
+        for (int row = 0; row < 3; ++row) {
+            for (int col = 0; col < 9; ++col) {
+                this.addSlot(new Slot(this.inventory, col + row * 9, 8 + col * 18, 18 + row * 18) {
+                    @Override
+                    public boolean canInsert(ItemStack stack) {
+                        return false;
+                    }
+
+                    @Override
+                    public boolean canTakeItems(PlayerEntity playerEntity) {
+                        return false;
+                    }
+                });
+            }
+        }
+
+        ItemStack infoItem = new ItemStack(Items.BOOK);
+        infoItem.set(DataComponentTypes.CUSTOM_NAME, TextUtil.parseFormatting(message));
+        inventory.setSlot(13, infoItem);
+
+        ItemStack confirmItem = new ItemStack(Items.LIME_WOOL);
+        confirmItem.set(DataComponentTypes.CUSTOM_NAME, Text.literal("[ Confirm ]").formatted(Formatting.GREEN));
+        inventory.setSlot(20, confirmItem);
+
+        ItemStack cancelItem = new ItemStack(Items.RED_WOOL);
+        cancelItem.set(DataComponentTypes.CUSTOM_NAME, Text.literal("[ Cancel ]").formatted(Formatting.RED));
+        inventory.setSlot(24, cancelItem);
+
+        for (int i = 0; i < 9; i++) {
+            this.addSlot(new Slot(playerInventory, i, 8 + i * 18, 142));
+        }
+    }
+
+    @Override
+    public ItemStack quickMove(PlayerEntity player, int index) {
+        return ItemStack.EMPTY;
+    }
+
+    @Override
+    public boolean canUse(PlayerEntity player) {
+        return true;
+    }
+
+    private void closeGui(PlayerEntity player) {
+        if (player instanceof ServerPlayerEntity serverPlayer) {
+            serverPlayer.networkHandler.sendPacket(new CloseScreenS2CPacket(this.syncId));
+        }
+    }
+
+    @Override
+    public void onSlotClick(int slotIndex, int button, SlotActionType actionType, PlayerEntity player) {
+        if (responded) {
+            closeGui(player);
+            return;
+        }
+
+        if (actionType != SlotActionType.PICKUP) {
+            if (player instanceof ServerPlayerEntity sp) {
+                sp.networkHandler.sendPacket(new ScreenHandlerSlotUpdateS2CPacket(this.syncId, 0, slotIndex, this.getSlot(slotIndex).getStack()));
+            }
+            return;
+        }
+
+        if (slotIndex == 20) {
+            responded = true;
+            closeGui(player);
+            if (callback != null) callback.accept(true);
+        } else if (slotIndex == 24) {
+            responded = true;
+            closeGui(player);
+            if (callback != null) callback.accept(false);
+        } else {
+            if (player instanceof ServerPlayerEntity sp) {
+                sp.networkHandler.sendPacket(new ScreenHandlerSlotUpdateS2CPacket(this.syncId, 0, slotIndex, this.getSlot(slotIndex).getStack()));
+            }
+        }
+    }
+
+    @Override
+    public void onClosed(PlayerEntity player) {
+        if (!responded) {
+            responded = true;
+            if (callback != null) callback.accept(false);
+        }
+        super.onClosed(player);
+    }
+}

src/main/java/com/gvsds/tcme/gui/GuiInventory.java

@@ -0,0 +1,87 @@
+package com.gvsds.tcme.gui;
+
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.entity.player.PlayerInventory;
+import net.minecraft.inventory.Inventory;
+import net.minecraft.item.ItemStack;
+import net.minecraft.screen.ScreenHandler;
+import net.minecraft.screen.slot.Slot;
+
+public class GuiInventory implements Inventory {
+
+    private final ItemStack[] items;
+
+    public GuiInventory(int size) {
+        this.items = new ItemStack[size];
+        for (int i = 0; i < size; i++) {
+            items[i] = ItemStack.EMPTY;
+        }
+    }
+
+    public void setSlot(int index, ItemStack stack) {
+        if (index >= 0 && index < items.length) {
+            items[index] = stack;
+        }
+    }
+
+    public void setSlot(int index, net.minecraft.item.Item item) {
+        setSlot(index, new ItemStack(item));
+    }
+
+    public void setSlot(int index, net.minecraft.item.Item item, int count) {
+        setSlot(index, new ItemStack(item, count));
+    }
+
+    @Override
+    public int size() {
+        return items.length;
+    }
+
+    @Override
+    public boolean isEmpty() {
+        for (ItemStack stack : items) {
+            if (!stack.isEmpty()) return false;
+        }
+        return true;
+    }
+
+    @Override
+    public ItemStack getStack(int slot) {
+        if (slot >= 0 && slot < items.length) {
+            return items[slot];
+        }
+        return ItemStack.EMPTY;
+    }
+
+    @Override
+    public ItemStack removeStack(int slot, int amount) {
+        return ItemStack.EMPTY;
+    }
+
+    @Override
+    public ItemStack removeStack(int slot) {
+        return ItemStack.EMPTY;
+    }
+
+    @Override
+    public void setStack(int slot, ItemStack stack) {
+        if (slot >= 0 && slot < items.length) {
+            items[slot] = stack.copy();
+        }
+    }
+
+    @Override
+    public void markDirty() {}
+
+    @Override
+    public boolean canPlayerUse(PlayerEntity player) {
+        return true;
+    }
+
+    @Override
+    public void clear() {
+        for (int i = 0; i < items.length; i++) {
+            items[i] = ItemStack.EMPTY;
+        }
+    }
+}

src/main/java/com/gvsds/tcme/gui/InputScreenHandler.java

@@ -0,0 +1,151 @@
+package com.gvsds.tcme.gui;
+
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.entity.player.PlayerInventory;
+import net.minecraft.inventory.Inventory;
+import net.minecraft.item.ItemStack;
+import net.minecraft.item.Items;
+import net.minecraft.network.packet.s2c.play.CloseScreenS2CPacket;
+import net.minecraft.screen.AnvilScreenHandler;
+import net.minecraft.screen.ScreenHandlerContext;
+import net.minecraft.screen.slot.SlotActionType;
+import net.minecraft.server.network.ServerPlayerEntity;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.UUID;
+import java.util.function.Consumer;
+
+public class InputScreenHandler extends AnvilScreenHandler {
+    private static final Map<UUID, InputSession> sessions = new HashMap<>();
+    private final UUID playerId;
+    private boolean closed = false;
+
+    public InputScreenHandler(int syncId, PlayerInventory playerInventory, String hint, Consumer<String> callback, ServerPlayerEntity sp) {
+        super(syncId, playerInventory, ScreenHandlerContext.create(sp.getEntityWorld(), sp.getBlockPos()));
+        this.playerId = sp.getUuid();
+
+        InputSession session = new InputSession(syncId, callback);
+        sessions.put(this.playerId, session);
+
+        ItemStack hintItem = new ItemStack(Items.PAPER);
+        hintItem.setCount(1);
+        this.getSlot(0).setStack(hintItem);
+    }
+
+    public static boolean hasSession(UUID playerId) {
+        InputSession session = sessions.get(playerId);
+        return session != null && !session.responded;
+    }
+
+    public static void submitInput(ServerPlayerEntity player, String text) {
+        InputSession session = sessions.get(player.getUuid());
+        if (session != null && !session.responded) {
+            session.responded = true;
+            player.networkHandler.sendPacket(new CloseScreenS2CPacket(session.syncId));
+            if (session.callback != null) {
+                session.callback.accept(text);
+            }
+            sessions.remove(player.getUuid());
+        }
+    }
+
+    @Override
+    public void onSlotClick(int slotIndex, int button, SlotActionType actionType, PlayerEntity player) {
+        if (slotIndex == 2) {
+            if (player instanceof ServerPlayerEntity sp && !closed) {
+                ItemStack result = this.getSlot(2).getStack();
+                if (!result.isEmpty()) {
+                    closed = true;
+                    InputSession session = sessions.get(sp.getUuid());
+                    if (session != null && !session.responded) {
+                        session.responded = true;
+                        String text = result.getName().getString();
+                        if (session.callback != null) {
+                            session.callback.accept(text);
+                        }
+                        sp.networkHandler.sendPacket(new CloseScreenS2CPacket(session.syncId));
+                        sessions.remove(sp.getUuid());
+                    }
+                }
+            }
+            return;
+        }
+        if (slotIndex == 0 || slotIndex == 1) {
+            return;
+        }
+        super.onSlotClick(slotIndex, button, actionType, player);
+    }
+
+    @Override
+    public void onClosed(PlayerEntity player) {
+        if (player instanceof ServerPlayerEntity sp) {
+            InputSession session = sessions.get(sp.getUuid());
+            if (session != null && !session.responded) {
+                session.responded = true;
+                if (session.callback != null) {
+                    session.callback.accept(null);
+                }
+            }
+            this.getSlot(0).setStack(ItemStack.EMPTY);
+            this.getSlot(1).setStack(ItemStack.EMPTY);
+            this.getSlot(2).setStack(ItemStack.EMPTY);
+            sessions.remove(sp.getUuid());
+        }
+        super.onClosed(player);
+    }
+
+    @Override
+    public ItemStack quickMove(PlayerEntity player, int index) {
+        return ItemStack.EMPTY;
+    }
+
+    @Override
+    public boolean canUse(PlayerEntity player) {
+        return true;
+    }
+
+    @Override
+    public boolean canTakeOutput(PlayerEntity player, boolean present) {
+        return false;
+    }
+
+    @Override
+    public boolean onButtonClick(PlayerEntity player, int id) {
+        if (id == 0 && !closed) {
+            ItemStack result = this.getSlot(2).getStack();
+            if (!result.isEmpty()) {
+                if (player instanceof ServerPlayerEntity sp) {
+                    closed = true;
+                    InputSession session = sessions.get(sp.getUuid());
+                    if (session != null && !session.responded) {
+                        session.responded = true;
+                        String text = result.getName().getString();
+                        if (session.callback != null) {
+                            session.callback.accept(text);
+                        }
+                        sp.networkHandler.sendPacket(new CloseScreenS2CPacket(session.syncId));
+                        sessions.remove(sp.getUuid());
+                        return true;
+                    }
+                }
+            }
+        }
+        return false;
+    }
+
+    @Override
+    public void onTakeOutput(PlayerEntity player, ItemStack stack) {
+    }
+
+    public static class InputSession {
+        public final int syncId;
+        public boolean responded;
+        public final Consumer<String> callback;
+
+        public InputSession(int syncId, Consumer<String> callback) {
+            this.syncId = syncId;
+            this.callback = callback;
+        }
+    }
+}

src/main/java/com/gvsds/tcme/gui/LargeChestScreenHandler.java

@@ -0,0 +1,66 @@
+package com.gvsds.tcme.gui;
+
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.entity.player.PlayerInventory;
+import net.minecraft.item.ItemStack;
+import net.minecraft.network.packet.s2c.play.ScreenHandlerSlotUpdateS2CPacket;
+import net.minecraft.screen.ScreenHandler;
+import net.minecraft.screen.ScreenHandlerType;
+import net.minecraft.screen.slot.Slot;
+import net.minecraft.screen.slot.SlotActionType;
+import net.minecraft.server.network.ServerPlayerEntity;
+
+public class LargeChestScreenHandler extends ScreenHandler {
+    private final GuiInventory inventory;
+
+    public LargeChestScreenHandler(int syncId, PlayerInventory playerInventory, GuiInventory guiInventory) {
+        super(ScreenHandlerType.GENERIC_9X6, syncId);
+        this.inventory = guiInventory;
+
+        for (int row = 0; row < 6; ++row) {
+            for (int col = 0; col < 9; ++col) {
+                this.addSlot(new Slot(this.inventory, col + row * 9, 8 + col * 18, 18 + row * 18) {
+                    @Override
+                    public boolean canInsert(ItemStack stack) {
+                        return false;
+                    }
+
+                    @Override
+                    public boolean canTakeItems(PlayerEntity playerEntity) {
+                        return false;
+                    }
+                });
+            }
+        }
+
+        for (int row = 0; row < 3; ++row) {
+            for (int col = 0; col < 9; ++col) {
+                this.addSlot(new Slot(playerInventory, col + row * 9 + 9, 8 + col * 18, 140 + row * 18));
+            }
+        }
+
+        for (int i = 0; i < 9; i++) {
+            this.addSlot(new Slot(playerInventory, i, 8 + i * 18, 198));
+        }
+    }
+
+    @Override
+    public ItemStack quickMove(PlayerEntity player, int index) {
+        return ItemStack.EMPTY;
+    }
+
+    @Override
+    public boolean canUse(PlayerEntity player) {
+        return true;
+    }
+
+    @Override
+    public void onSlotClick(int slotIndex, int button, SlotActionType actionType, PlayerEntity player) {
+        if (player instanceof ServerPlayerEntity sp) {
+            if (slotIndex >= 0 && slotIndex < 54) {
+                sp.networkHandler.sendPacket(new ScreenHandlerSlotUpdateS2CPacket(this.syncId, 0, slotIndex, this.getSlot(slotIndex).getStack()));
+            }
+            sp.networkHandler.sendPacket(new ScreenHandlerSlotUpdateS2CPacket(this.syncId, -1, -1, ItemStack.EMPTY));
+        }
+    }
+}

src/main/java/com/gvsds/tcme/gui/ServerGuiAPI.java

@@ -0,0 +1,134 @@
+package com.gvsds.tcme.gui;
+
+import com.gvsds.tcme.util.TextUtil;
+import net.minecraft.entity.player.PlayerInventory;
+import net.minecraft.screen.GenericContainerScreenHandler;
+import net.minecraft.screen.NamedScreenHandlerFactory;
+import net.minecraft.screen.ScreenHandler;
+import net.minecraft.screen.AnvilScreenHandler;
+import net.minecraft.screen.ScreenHandlerContext;
+import net.minecraft.server.network.ServerPlayerEntity;
+import net.minecraft.text.Text;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.function.Consumer;
+
+public class ServerGuiAPI {
+
+    public static void showAlert(ServerPlayerEntity player, String title, String message) {
+        showAlert(player, title, message, null);
+    }
+
+    public static void showAlert(ServerPlayerEntity player, String title, String message, Consumer<Boolean> onClose) {
+        NamedScreenHandlerFactory factory = new NamedScreenHandlerFactory() {
+            @Override
+            public Text getDisplayName() {
+                return TextUtil.parseFormatting(title);
+            }
+
+            @Nullable
+            @Override
+            public ScreenHandler createMenu(int syncId, PlayerInventory playerInv, net.minecraft.entity.player.PlayerEntity player) {
+                return new AlertScreenHandler(syncId, playerInv, message, onClose);
+            }
+        };
+        player.openHandledScreen(factory);
+    }
+
+    public static void showConfirm(ServerPlayerEntity player, String title, String message, Consumer<Boolean> onConfirm) {
+        NamedScreenHandlerFactory factory = new NamedScreenHandlerFactory() {
+            @Override
+            public Text getDisplayName() {
+                return TextUtil.parseFormatting(title);
+            }
+
+            @Nullable
+            @Override
+            public ScreenHandler createMenu(int syncId, PlayerInventory playerInv, net.minecraft.entity.player.PlayerEntity player) {
+                return new ConfirmScreenHandler(syncId, playerInv, message, onConfirm);
+            }
+        };
+        player.openHandledScreen(factory);
+    }
+
+    public static void showInputBox(ServerPlayerEntity player, String title, String hint, Consumer<String> onSubmit) {
+        NamedScreenHandlerFactory factory = new NamedScreenHandlerFactory() {
+            @Override
+            public Text getDisplayName() {
+                return TextUtil.parseFormatting(title);
+            }
+
+            @Nullable
+            @Override
+            public ScreenHandler createMenu(int syncId, PlayerInventory playerInv, net.minecraft.entity.player.PlayerEntity player) {
+                return new InputScreenHandler(syncId, playerInv, hint, onSubmit, player instanceof ServerPlayerEntity ? (ServerPlayerEntity) player : null);
+            }
+        };
+        player.openHandledScreen(factory);
+    }
+
+    public static void showSmallChest(ServerPlayerEntity player, String title, Consumer<Integer> onSlotClick) {
+        GuiInventory inventory = new GuiInventory(9);
+        player.openHandledScreen(new NamedScreenHandlerFactory() {
+            @Override
+            public Text getDisplayName() {
+                return TextUtil.parseFormatting(title);
+            }
+
+            @Nullable
+            @Override
+            public ScreenHandler createMenu(int syncId, PlayerInventory playerInv, net.minecraft.entity.player.PlayerEntity player) {
+                return new SmallChestScreenHandler(syncId, playerInv, inventory);
+            }
+        });
+    }
+
+    public static void showMediumChest(ServerPlayerEntity player, String title, Consumer<Integer> onSlotClick) {
+        GuiInventory inventory = new GuiInventory(27);
+        player.openHandledScreen(new NamedScreenHandlerFactory() {
+            @Override
+            public Text getDisplayName() {
+                return TextUtil.parseFormatting(title);
+            }
+
+            @Nullable
+            @Override
+            public ScreenHandler createMenu(int syncId, PlayerInventory playerInv, net.minecraft.entity.player.PlayerEntity player) {
+                return GenericContainerScreenHandler.createGeneric9x3(syncId, playerInv, inventory);
+            }
+        });
+    }
+
+    public static void showLargeChest(ServerPlayerEntity player, String title, Consumer<Integer> onSlotClick) {
+        GuiInventory inventory = new GuiInventory(54);
+        player.openHandledScreen(new NamedScreenHandlerFactory() {
+            @Override
+            public Text getDisplayName() {
+                return TextUtil.parseFormatting(title);
+            }
+
+            @Nullable
+            @Override
+            public ScreenHandler createMenu(int syncId, PlayerInventory playerInv, net.minecraft.entity.player.PlayerEntity player) {
+                return new LargeChestScreenHandler(syncId, playerInv, inventory);
+            }
+        });
+    }
+
+    public static void showAnvil(ServerPlayerEntity player, String title) {
+        player.openHandledScreen(new NamedScreenHandlerFactory() {
+            @Override
+            public Text getDisplayName() {
+                return TextUtil.parseFormatting(title);
+            }
+
+            @Nullable
+            @Override
+            public ScreenHandler createMenu(int syncId, PlayerInventory playerInv, net.minecraft.entity.player.PlayerEntity player) {
+                ServerPlayerEntity sp = (ServerPlayerEntity) player;
+                return new AnvilScreenHandler(syncId, playerInv,
+                    ScreenHandlerContext.create(sp.getEntityWorld(), sp.getBlockPos()));
+            }
+        });
+    }
+}

src/main/java/com/gvsds/tcme/gui/SmallChestScreenHandler.java

@@ -0,0 +1,60 @@
+package com.gvsds.tcme.gui;
+
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.entity.player.PlayerInventory;
+import net.minecraft.item.ItemStack;
+import net.minecraft.network.packet.s2c.play.ScreenHandlerSlotUpdateS2CPacket;
+import net.minecraft.screen.ScreenHandler;
+import net.minecraft.screen.ScreenHandlerType;
+import net.minecraft.screen.slot.Slot;
+import net.minecraft.screen.slot.SlotActionType;
+import net.minecraft.server.network.ServerPlayerEntity;
+
+public class SmallChestScreenHandler extends ScreenHandler {
+    private final GuiInventory inventory;
+
+    public SmallChestScreenHandler(int syncId, PlayerInventory playerInventory, GuiInventory guiInventory) {
+        super(ScreenHandlerType.GENERIC_9X1, syncId);
+        this.inventory = guiInventory;
+
+        for (int col = 0; col < 9; ++col) {
+            this.addSlot(new Slot(this.inventory, col, 8 + col * 18, 18) {
+                @Override
+                public boolean canInsert(ItemStack stack) {
+                    return false;
+                }
+
+                @Override
+                public boolean canTakeItems(PlayerEntity playerEntity) {
+                    return false;
+                }
+            });
+        }
+
+        for (int row = 0; row < 3; ++row) {
+            for (int col = 0; col < 9; ++col) {
+                this.addSlot(new Slot(playerInventory, col + row * 9 + 9, 8 + col * 18, 84 + row * 18));
+            }
+        }
+    }
+
+    @Override
+    public ItemStack quickMove(PlayerEntity player, int index) {
+        return ItemStack.EMPTY;
+    }
+
+    @Override
+    public boolean canUse(PlayerEntity player) {
+        return true;
+    }
+
+    @Override
+    public void onSlotClick(int slotIndex, int button, SlotActionType actionType, PlayerEntity player) {
+        if (player instanceof ServerPlayerEntity sp) {
+            if (slotIndex >= 0 && slotIndex < 9) {
+                sp.networkHandler.sendPacket(new ScreenHandlerSlotUpdateS2CPacket(this.syncId, 0, slotIndex, this.getSlot(slotIndex).getStack()));
+            }
+            sp.networkHandler.sendPacket(new ScreenHandlerSlotUpdateS2CPacket(this.syncId, -1, -1, ItemStack.EMPTY));
+        }
+    }
+}

src/main/java/com/gvsds/tcme/i18n/LanguageManager.java

@@ -0,0 +1,225 @@
+package com.gvsds.tcme.i18n;
+
+import com.gvsds.tcme.CardinalCooperativeCapitalismMarketEconomy;
+import com.gvsds.tcme.database.DatabaseManager;
+
+import java.nio.ByteBuffer;
+import java.sql.*;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Optional;
+import java.util.UUID;
+
+public class LanguageManager {
+
+    private static final Map<String, Map<String, String>> LANGUAGES = new HashMap<>();
+
+    private final Map<UUID, String> playerLanguages = new HashMap<>();
+    private DatabaseManager dbManager;
+    private boolean isMySQL;
+
+    public LanguageManager(DatabaseManager dbManager, boolean isMySQL) {
+        this.dbManager = dbManager;
+        this.isMySQL = isMySQL;
+        loadLanguages();
+        loadAllPlayerLanguages();
+    }
+
+    private void loadLanguages() {
+        Map<String, String> enUS = new HashMap<>();
+        enUS.put("cme.wallet.title", "=== Your Wallet ===");
+        enUS.put("cme.wallet.balance", "  %s: %.2f %s");
+        enUS.put("cme.wallet.empty", "Your wallet is empty.");
+        enUS.put("cme.lang.changed", "Language changed to %s");
+        enUS.put("cme.lang.available", "Available languages: %s");
+        enUS.put("cme.lang.notfound", "Language not found: %s");
+        enUS.put("cme.currency.created", "Created currency: %s (%s) - Tradable: %s");
+        enUS.put("cme.currency.create_failed", "Failed to create currency: %s");
+        enUS.put("cme.currency.deleted", "Deleted currency: %s");
+        enUS.put("cme.currency.delete_failed", "Failed to delete currency: %s");
+        enUS.put("cme.currency.tradable", "Currency %s tradable set to: %s");
+        enUS.put("cme.currency.tradable_failed", "Failed to set tradable for currency: %s");
+        enUS.put("cme.currency.list", "Currencies:");
+        enUS.put("cme.currency.not_found", "Currency not found: %s");
+        enUS.put("cme.currency.no_currencies", "No currencies found");
+        enUS.put("cme.currency.no_available", "No currencies available");
+        enUS.put("cme.currency.not_tradable", "Currency %s does not allow free trading");
+        enUS.put("cme.balance.check", "%s's balance: %.2f %s");
+        enUS.put("cme.balance.added", "Added %.2f %s to %s");
+        enUS.put("cme.balance.removed", "Removed %.2f %s from %s");
+        enUS.put("cme.balance.failed", "Failed to %s balance");
+        enUS.put("cme.pay.success", "Successfully paid %.2f %s to %s");
+        enUS.put("cme.pay.received", "%s paid you %.2f %s");
+        enUS.put("cme.pay.failed", "Payment failed. Insufficient balance or other error");
+        enUS.put("cme.pay.self", "Cannot pay yourself");
+        enUS.put("cme.apay.sent", "Payment request sent to %s: %.2f %s [ID: %s]");
+        enUS.put("cme.apay.received", "%s requested %.2f %s from you [ID: %s]");
+        enUS.put("cme.apay.self", "Cannot request payment from yourself");
+        enUS.put("cme.apay.failed", "Failed to create payment request");
+        enUS.put("cme.requests.list", "Pending payment requests:");
+        enUS.put("cme.requests.empty", "No pending payment requests");
+        enUS.put("cme.requests.item", "  [ID: %s] Requested: %.2f (Currency: %s)");
+        enUS.put("cme.requests.accepted", "Payment request #%s accepted");
+        enUS.put("cme.requests.accept_failed", "Failed to accept payment request #%s");
+        enUS.put("cme.requests.cancelled", "Payment request #%s cancelled");
+        enUS.put("cme.requests.cancel_failed", "Failed to cancel payment request #%s");
+        enUS.put("cme.currency.renamed", "Renamed currency: %s -> %s");
+        enUS.put("cme.currency.rename_failed", "Failed to rename currency: %s");
+        enUS.put("cme.currency.updated", "Updated currency %s: symbol=%s, tradable=%s");
+        enUS.put("cme.currency.update_failed", "Failed to update currency: %s");
+        enUS.put("cme.currency.list_item", "  %s (%s) - Tradable: %s - Rate: %.2f");
+        enUS.put("cme.lang.usage", "Use /cme lang <language> to change");
+        enUS.put("cme.exchange_rate.set", "Exchange rate for %s set to: %.2f");
+        enUS.put("cme.exchange_rate.list", "Exchange Rates (relative to base):");
+        enUS.put("cme.exchange_rate.item", "  %s: %.2f");
+        enUS.put("cme.convert.invalid_amount", "Amount must be greater than 0");
+        enUS.put("cme.convert.same_currency", "Cannot convert to the same currency");
+        enUS.put("cme.convert.insufficient", "Insufficient balance. You have %s %s, but need %s");
+        enUS.put("cme.convert.title", "=== Currency Conversion Preview ===");
+        enUS.put("cme.convert.from", "  From: %s %s (%s)");
+        enUS.put("cme.convert.to", "  To: %s %s (%s)");
+        enUS.put("cme.convert.rate", "  Rate: %s : %s = %.2f : %.2f");
+        enUS.put("cme.convert.balance_from", "  Current %s balance: %s");
+        enUS.put("cme.convert.balance_to", "  Total %s balance after conversion: %s");
+        enUS.put("cme.convert.prompt", "Use /cme convert %s %s %s confirm to proceed");
+        enUS.put("cme.convert.success", "Successfully converted %s %s to %s %s");
+        enUS.put("cme.convert.failed", "Conversion failed. Please try again");
+        enUS.put("cme.convert.refunded", "Conversion failed. Your balance has been refunded");
+        enUS.put("cme.requests.rejected", "Rejected payment request #%s");
+        enUS.put("cme.requests.reject_failed", "Failed to reject payment request #%s");
+        enUS.put("cme.requests.rejected_by", "%s rejected your payment request #%s: %.2f %s");
+        enUS.put("cme.requests.revoked", "Revoked payment request #%s");
+        enUS.put("cme.requests.revoke_failed", "Failed to revoke payment request #%s");
+        enUS.put("cme.requests.revoked_by", "%s revoked payment request #%s: %.2f %s");
+        enUS.put("cme.requests.accepted_by", "%s accepted your payment request #%s: %.2f %s");
+        enUS.put("cme.requests.not_yours", "This is not your request");
+        enUS.put("cme.requests.not_pending", "This request is no longer pending");
+        LANGUAGES.put("en_us", enUS);
+
+        Map<String, String> zhCN = new HashMap<>();
+        zhCN.put("cme.wallet.title", "=== 你的钱包 ===");
+        zhCN.put("cme.wallet.balance", "  %s: %.2f %s");
+        zhCN.put("cme.wallet.empty", "你的钱包是空的。");
+        zhCN.put("cme.lang.changed", "语言已更改为 %s");
+        zhCN.put("cme.lang.available", "可用语言: %s");
+        zhCN.put("cme.lang.notfound", "未找到语言: %s");
+        zhCN.put("cme.currency.created", "创建币种: %s (%s) - 可自由交易: %s");
+        zhCN.put("cme.currency.create_failed", "创建币种失败: %s");
+        zhCN.put("cme.currency.deleted", "已删除ID为 %s 的币种");
+        zhCN.put("cme.currency.delete_failed", "删除币种失败: %s");
+        zhCN.put("cme.currency.tradable", "币种 %s 的自由交易设置为: %s");
+        zhCN.put("cme.currency.tradable_failed", "设置币种自由交易失败: %s");
+        zhCN.put("cme.currency.list", "币种列表:");
+        zhCN.put("cme.currency.not_found", "未找到币种: %s");
+        zhCN.put("cme.currency.no_currencies", "未找到任何币种");
+        zhCN.put("cme.currency.no_available", "没有可用的币种");
+        zhCN.put("cme.currency.not_tradable", "币种 %s 不允许自由交易");
+        zhCN.put("cme.balance.check", "%s 的余额: %.2f %s");
+        zhCN.put("cme.balance.added", "已添加 %.2f %s 到 %s");
+        zhCN.put("cme.balance.removed", "已移除 %.2f %s (来自 %s)");
+        zhCN.put("cme.balance.failed", "余额操作失败");
+        zhCN.put("cme.pay.success", "成功支付 %.2f %s 给 %s");
+        zhCN.put("cme.pay.received", "%s 向你支付了 %.2f %s");
+        zhCN.put("cme.pay.failed", "支付失败，余额不足或其他错误");
+        zhCN.put("cme.pay.self", "不能支付给自己");
+        zhCN.put("cme.apay.sent", "已向 %s 发送支付请求: %.2f %s [ID: %s]");
+        zhCN.put("cme.apay.received", "%s 请求你支付 %.2f %s [ID: %s]");
+        zhCN.put("cme.apay.self", "不能向自己请求支付");
+        zhCN.put("cme.apay.failed", "创建支付请求失败");
+        zhCN.put("cme.requests.list", "待处理的支付请求:");
+        zhCN.put("cme.requests.empty", "没有待处理的支付请求");
+        zhCN.put("cme.requests.item", "  [ID: %s] 请求金额: %.2f (币种: %s)");
+        zhCN.put("cme.requests.accepted", "已接受支付请求 #%s");
+        zhCN.put("cme.requests.accept_failed", "接受支付请求 #%s 失败");
+        zhCN.put("cme.requests.cancelled", "已取消支付请求 #%s");
+        zhCN.put("cme.requests.cancel_failed", "取消支付请求 #%s 失败");
+        zhCN.put("cme.currency.renamed", "已将货币从 %s 重命名为 %s");
+        zhCN.put("cme.currency.rename_failed", "重命名货币 %s 失败");
+        zhCN.put("cme.currency.updated", "已更新货币 %s: 符号=%s, 可交易=%s");
+        zhCN.put("cme.currency.update_failed", "更新货币 %s 失败");
+        zhCN.put("cme.currency.list_item", "  %s (%s) - 可交易: %s - 汇率: %.2f");
+        zhCN.put("cme.lang.usage", "使用 /cme lang <语言> 来切换语言");
+        zhCN.put("cme.exchange_rate.set", "%s 的汇率已设置为: %.2f");
+        zhCN.put("cme.exchange_rate.list", "汇率列表（相对基准汇率）:");
+        zhCN.put("cme.exchange_rate.item", "  %s: %.2f");
+        zhCN.put("cme.convert.invalid_amount", "数量必须大于 0");
+        zhCN.put("cme.convert.same_currency", "不能转换为相同的货币");
+        zhCN.put("cme.convert.insufficient", "余额不足。你有 %s %s，但需要 %s");
+        zhCN.put("cme.convert.title", "=== 货币转换预览 ===");
+        zhCN.put("cme.convert.from", "  来源: %s %s (%s)");
+        zhCN.put("cme.convert.to", "  目标: %s %s (%s)");
+        zhCN.put("cme.convert.rate", "  汇率: %s : %s = %.2f : %.2f");
+        zhCN.put("cme.convert.balance_from", "  当前 %s 余额: %s");
+        zhCN.put("cme.convert.balance_to", "  转换后 %s 总余额: %s");
+        zhCN.put("cme.convert.prompt", "使用 /cme convert %s %s %s confirm 确认执行");
+        zhCN.put("cme.convert.success", "成功将 %s %s 转换为 %s %s");
+        zhCN.put("cme.convert.failed", "转换失败，请重试");
+        zhCN.put("cme.convert.refunded", "转换失败，已退还扣除的货币");
+        zhCN.put("cme.requests.rejected", "已拒绝付款请求 #%s");
+        zhCN.put("cme.requests.reject_failed", "拒绝付款请求 #%s 失败");
+        zhCN.put("cme.requests.rejected_by", "%s 拒绝了你的付款请求 #%s: %.2f %s");
+        zhCN.put("cme.requests.revoked", "已撤回付款请求 #%s");
+        zhCN.put("cme.requests.revoke_failed", "撤回付款请求 #%s 失败");
+        zhCN.put("cme.requests.revoked_by", "%s 撤回了付款请求 #%s: %.2f %s");
+        zhCN.put("cme.requests.accepted_by", "%s 已接受你的付款请求 #%s: %.2f %s");
+        zhCN.put("cme.requests.not_yours", "这不是你的请求");
+        zhCN.put("cme.requests.not_pending", "该请求已不在待处理状态");
+        LANGUAGES.put("zh_cn", zhCN);
+    }
+
+    private void loadAllPlayerLanguages() {
+        if (dbManager == null || !dbManager.isConnected()) {
+            CardinalCooperativeCapitalismMarketEconomy.LOGGER.warn("Database not connected, cannot load player languages");
+            return;
+        }
+
+        String sql = "SELECT user_uuid, language FROM cme_player_settings";
+        try (Connection conn = dbManager.getConnection();
+             Statement stmt = conn.createStatement();
+             ResultSet rs = stmt.executeQuery(sql)) {
+            while (rs.next()) {
+                byte[] uuidBytes = rs.getBytes("user_uuid");
+                if (uuidBytes != null && uuidBytes.length == 16) {
+                    UUID uuid = bytesToUUID(uuidBytes);
+                    String lang = rs.getString("language");
+                    playerLanguages.put(uuid, lang.toLowerCase());
+                }
+            }
+            CardinalCooperativeCapitalismMarketEconomy.LOGGER.info("Loaded {} player language settings", playerLanguages.size());
+        } catch (SQLException e) {
+            CardinalCooperativeCapitalismMarketEconomy.LOGGER.error("Failed to load player languages", e);
+        }
+    }
+
+    public void setPlayerLanguage(UUID playerUUID, String language) {
+        playerLanguages.put(playerUUID, language.toLowerCase());
+    }
+
+    public String getPlayerLanguage(UUID playerUUID) {
+        if (playerUUID == null) {
+            return "en_us";
+        }
+        return playerLanguages.getOrDefault(playerUUID, "en_us");
+    }
+
+    public String getMessageRaw(UUID playerUUID, String key) {
+        String lang = getPlayerLanguage(playerUUID);
+        Map<String, String> langMap = LANGUAGES.getOrDefault(lang, LANGUAGES.get("en_us"));
+        return langMap.getOrDefault(key, key);
+    }
+
+    public boolean hasLanguage(String lang) {
+        return LANGUAGES.containsKey(lang.toLowerCase());
+    }
+
+    public String getAvailableLanguages() {
+        return String.join(", ", LANGUAGES.keySet());
+    }
+
+    private UUID bytesToUUID(byte[] bytes) {
+        ByteBuffer buffer = ByteBuffer.wrap(bytes);
+        long mostSigBits = buffer.getLong();
+        long leastSigBits = buffer.getLong();
+        return new UUID(mostSigBits, leastSigBits);
+    }
+}

src/main/java/com/gvsds/tcme/manager/BalanceManager.java

@@ -0,0 +1,157 @@
+package com.gvsds.tcme.manager;
+
+import com.gvsds.tcme.CardinalCooperativeCapitalismMarketEconomy;
+import com.gvsds.tcme.config.Config;
+import com.gvsds.tcme.database.DatabaseManager;
+import com.gvsds.tcme.model.PlayerBalance;
+
+import java.nio.ByteBuffer;
+import java.sql.*;
+import java.util.Optional;
+import java.util.UUID;
+
+public class BalanceManager {
+
+    private final DatabaseManager dbManager;
+    private final Config.Tables tables;
+    private final boolean isMySQL;
+
+    public BalanceManager(DatabaseManager dbManager, Config.Tables tables, boolean isMySQL) {
+        this.dbManager = dbManager;
+        this.tables = tables;
+        this.isMySQL = isMySQL;
+    }
+
+    public double getBalance(UUID playerUUID, int currencyId) {
+        String sql = String.format("SELECT balance FROM %s WHERE user_uuid = ? AND currency_id = ?", tables.getBalances());
+        Connection conn = null;
+        try {
+            conn = dbManager.getConnection();
+            try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+                setUUIDParameter(stmt, 1, playerUUID);
+                stmt.setInt(2, currencyId);
+                try (ResultSet rs = stmt.executeQuery()) {
+                    if (rs.next()) {
+                        return rs.getDouble("balance");
+                    }
+                }
+            }
+            conn.commit();
+        } catch (SQLException e) {
+            CardinalCooperativeCapitalismMarketEconomy.LOGGER.error("Failed to get balance for player: {}", playerUUID, e);
+            if (conn != null) { try { conn.rollback(); } catch (SQLException ignored) {} }
+        } finally {
+            if (conn != null) { try { conn.close(); } catch (SQLException ignored) {} }
+        }
+        return 0.0;
+    }
+
+    public boolean setBalance(UUID playerUUID, int currencyId, double amount) {
+        Connection conn = null;
+        try {
+            conn = dbManager.getConnection();
+            boolean result = setBalance(conn, playerUUID, currencyId, amount);
+            if (result) {
+                conn.commit();
+            } else {
+                conn.rollback();
+            }
+            return result;
+        } catch (SQLException e) {
+            CardinalCooperativeCapitalismMarketEconomy.LOGGER.error("Failed to set balance for player: {}", playerUUID, e);
+            if (conn != null) { try { conn.rollback(); } catch (SQLException ignored) {} }
+        } finally {
+            if (conn != null) { try { conn.close(); } catch (SQLException ignored) {} }
+        }
+        return false;
+    }
+
+    public boolean addBalance(UUID playerUUID, int currencyId, double amount) {
+        double currentBalance = getBalance(playerUUID, currencyId);
+        return setBalance(playerUUID, currencyId, currentBalance + amount);
+    }
+
+    public double getBalance(Connection conn, UUID playerUUID, int currencyId) throws SQLException {
+        String sql = String.format("SELECT balance FROM %s WHERE user_uuid = ? AND currency_id = ?", tables.getBalances());
+        try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+            setUUIDParameter(stmt, 1, playerUUID);
+            stmt.setInt(2, currencyId);
+            try (ResultSet rs = stmt.executeQuery()) {
+                if (rs.next()) {
+                    return rs.getDouble("balance");
+                }
+            }
+        }
+        return 0.0;
+    }
+
+    public boolean setBalance(Connection conn, UUID playerUUID, int currencyId, double amount) throws SQLException {
+        String sql;
+        if (isMySQL) {
+            sql = String.format(
+                "INSERT INTO %s (user_uuid, currency_id, balance, created_at, updated_at) VALUES (?, ?, ?, CURRENT_TIMESTAMP, CURRENT_TIMESTAMP) " +
+                "ON DUPLICATE KEY UPDATE balance = VALUES(balance), updated_at = CURRENT_TIMESTAMP",
+                tables.getBalances()
+            );
+        } else {
+            sql = String.format(
+                "INSERT INTO %s (user_uuid, currency_id, balance, created_at, updated_at) VALUES (?, ?, ?, CURRENT_TIMESTAMP, CURRENT_TIMESTAMP) " +
+                "ON CONFLICT(user_uuid, currency_id) DO UPDATE SET balance = excluded.balance, updated_at = CURRENT_TIMESTAMP",
+                tables.getBalances()
+            );
+        }
+        try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+            setUUIDParameter(stmt, 1, playerUUID);
+            stmt.setInt(2, currencyId);
+            stmt.setDouble(3, amount);
+            stmt.executeUpdate();
+            return true;
+        }
+    }
+
+    public boolean addBalance(Connection conn, UUID playerUUID, int currencyId, double amount) throws SQLException {
+        double currentBalance = getBalance(conn, playerUUID, currencyId);
+        return setBalance(conn, playerUUID, currencyId, currentBalance + amount);
+    }
+
+    public boolean subtractBalance(UUID playerUUID, int currencyId, double amount) {
+        double currentBalance = getBalance(playerUUID, currencyId);
+        if (currentBalance < amount) {
+            return false;
+        }
+        return setBalance(playerUUID, currencyId, currentBalance - amount);
+    }
+
+    public boolean hasSufficientBalance(UUID playerUUID, int currencyId, double amount) {
+        return getBalance(playerUUID, currencyId) >= amount;
+    }
+
+    private void setUUIDParameter(PreparedStatement stmt, int parameterIndex, UUID uuid) throws SQLException {
+        ByteBuffer buffer = ByteBuffer.wrap(new byte[16]);
+        buffer.putLong(uuid.getMostSignificantBits());
+        buffer.putLong(uuid.getLeastSignificantBits());
+        stmt.setBytes(parameterIndex, buffer.array());
+    }
+
+    public UUID getUUIDFromResultSet(ResultSet rs, String columnName) throws SQLException {
+        byte[] bytes = rs.getBytes(columnName);
+        if (bytes == null) {
+            return null;
+        }
+        return bytesToUUID(bytes);
+    }
+
+    private byte[] uuidToBytes(UUID uuid) {
+        ByteBuffer buffer = ByteBuffer.wrap(new byte[16]);
+        buffer.putLong(uuid.getMostSignificantBits());
+        buffer.putLong(uuid.getLeastSignificantBits());
+        return buffer.array();
+    }
+
+    private UUID bytesToUUID(byte[] bytes) {
+        ByteBuffer buffer = ByteBuffer.wrap(bytes);
+        long mostSigBits = buffer.getLong();
+        long leastSigBits = buffer.getLong();
+        return new UUID(mostSigBits, leastSigBits);
+    }
+}

src/main/java/com/gvsds/tcme/manager/CurrencyManager.java

@@ -0,0 +1,286 @@
+package com.gvsds.tcme.manager;
+
+import com.gvsds.tcme.CardinalCooperativeCapitalismMarketEconomy;
+import com.gvsds.tcme.config.Config;
+import com.gvsds.tcme.database.DatabaseManager;
+import com.gvsds.tcme.model.Currency;
+
+import java.sql.*;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+
+public class CurrencyManager {
+
+    private final DatabaseManager dbManager;
+    private final Config.Tables tables;
+
+    public CurrencyManager(DatabaseManager dbManager, Config.Tables tables) {
+        this.dbManager = dbManager;
+        this.tables = tables;
+    }
+
+    public Optional<Currency> createCurrency(String name, String symbol, boolean tradable) {
+        String sql = String.format("INSERT INTO %s (name, symbol, tradable) VALUES (?, ?, ?)", tables.getCurrencies());
+        Connection conn = null;
+        try {
+            conn = dbManager.getConnection();
+            try (PreparedStatement stmt = conn.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS)) {
+                stmt.setString(1, name);
+                stmt.setString(2, symbol);
+                stmt.setInt(3, tradable ? 1 : 0);
+                stmt.executeUpdate();
+
+                try (ResultSet rs = stmt.getGeneratedKeys()) {
+                    if (rs.next()) {
+                        Currency currency = new Currency(name, symbol, tradable);
+                        currency.setId(rs.getInt(1));
+                        CardinalCooperativeCapitalismMarketEconomy.LOGGER.info("Created currency: {} ({})", name, symbol);
+                        conn.commit();
+                        return Optional.of(currency);
+                    }
+                }
+            }
+            conn.rollback();
+        } catch (SQLException e) {
+            CardinalCooperativeCapitalismMarketEconomy.LOGGER.error("Failed to create currency: {}", name, e);
+            if (conn != null) { try { conn.rollback(); } catch (SQLException ignored) {} }
+        } finally {
+            if (conn != null) { try { conn.close(); } catch (SQLException ignored) {} }
+        }
+        return Optional.empty();
+    }
+
+    public boolean deleteCurrency(String name) {
+        String sql = String.format("DELETE FROM %s WHERE name = ?", tables.getCurrencies());
+        Connection conn = null;
+        try {
+            conn = dbManager.getConnection();
+            try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+                stmt.setString(1, name);
+                int rows = stmt.executeUpdate();
+                if (rows > 0) {
+                    conn.commit();
+                    CardinalCooperativeCapitalismMarketEconomy.LOGGER.info("Deleted currency: {}", name);
+                    return true;
+                }
+            }
+            conn.rollback();
+        } catch (SQLException e) {
+            CardinalCooperativeCapitalismMarketEconomy.LOGGER.error("Failed to delete currency: {}", name, e);
+            if (conn != null) { try { conn.rollback(); } catch (SQLException ignored) {} }
+        } finally {
+            if (conn != null) { try { conn.close(); } catch (SQLException ignored) {} }
+        }
+        return false;
+    }
+
+    public boolean deleteCurrency(int currencyId) {
+        String sql = String.format("DELETE FROM %s WHERE id = ?", tables.getCurrencies());
+        Connection conn = null;
+        try {
+            conn = dbManager.getConnection();
+            try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+                stmt.setInt(1, currencyId);
+                int rows = stmt.executeUpdate();
+                if (rows > 0) {
+                    conn.commit();
+                    CardinalCooperativeCapitalismMarketEconomy.LOGGER.info("Deleted currency with ID: {}", currencyId);
+                    return true;
+                }
+            }
+            conn.rollback();
+        } catch (SQLException e) {
+            CardinalCooperativeCapitalismMarketEconomy.LOGGER.error("Failed to delete currency: {}", currencyId, e);
+            if (conn != null) { try { conn.rollback(); } catch (SQLException ignored) {} }
+        } finally {
+            if (conn != null) { try { conn.close(); } catch (SQLException ignored) {} }
+        }
+        return false;
+    }
+
+    public boolean renameCurrency(String oldName, String newName) {
+        String sql = String.format("UPDATE %s SET name = ? WHERE name = ?", tables.getCurrencies());
+
+        Connection conn = null;
+        try {
+            conn = dbManager.getConnection();
+
+            try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+                stmt.setString(1, newName);
+                stmt.setString(2, oldName);
+                int rows = stmt.executeUpdate();
+                if (rows == 0) {
+                    conn.rollback();
+                    return false;
+                }
+            }
+
+            try (PreparedStatement stmt = conn.prepareStatement("UPDATE cme_exchange_rates SET currency_name = ? WHERE currency_name = ?")) {
+                stmt.setString(1, newName);
+                stmt.setString(2, oldName);
+                stmt.executeUpdate();
+            }
+
+            conn.commit();
+            CardinalCooperativeCapitalismMarketEconomy.LOGGER.info("Renamed currency: {} -> {}", oldName, newName);
+            return true;
+        } catch (SQLException e) {
+            CardinalCooperativeCapitalismMarketEconomy.LOGGER.error("Failed to rename currency: {}", oldName, e);
+            if (conn != null) { try { conn.rollback(); } catch (SQLException ignored) {} }
+        } finally {
+            if (conn != null) { try { conn.close(); } catch (SQLException ignored) {} }
+        }
+        return false;
+    }
+
+    public boolean updateCurrency(String name, String newSymbol, Boolean newTradable) {
+        StringBuilder sqlBuilder = new StringBuilder(String.format("UPDATE %s SET ", tables.getCurrencies()));
+        boolean first = true;
+
+        if (newSymbol != null) {
+            sqlBuilder.append("symbol = ?");
+            first = false;
+        }
+        if (newTradable != null) {
+            if (!first) sqlBuilder.append(", ");
+            sqlBuilder.append("tradable = ?");
+        }
+
+        sqlBuilder.append(" WHERE name = ?");
+        String sql = sqlBuilder.toString();
+
+        Connection conn = null;
+        try {
+            conn = dbManager.getConnection();
+            try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+                int paramIndex = 1;
+                if (newSymbol != null) {
+                    stmt.setString(paramIndex++, newSymbol);
+                }
+                if (newTradable != null) {
+                    stmt.setInt(paramIndex++, newTradable ? 1 : 0);
+                }
+                stmt.setString(paramIndex, name);
+
+                int rows = stmt.executeUpdate();
+                if (rows > 0) {
+                    conn.commit();
+                    CardinalCooperativeCapitalismMarketEconomy.LOGGER.info("Updated currency: {}", name);
+                    return true;
+                }
+            }
+            conn.rollback();
+        } catch (SQLException e) {
+            CardinalCooperativeCapitalismMarketEconomy.LOGGER.error("Failed to update currency: {}", name, e);
+            if (conn != null) { try { conn.rollback(); } catch (SQLException ignored) {} }
+        } finally {
+            if (conn != null) { try { conn.close(); } catch (SQLException ignored) {} }
+        }
+        return false;
+    }
+
+    public boolean setTradable(int currencyId, boolean tradable) {
+        String sql = String.format("UPDATE %s SET tradable = ? WHERE id = ?", tables.getCurrencies());
+        Connection conn = null;
+        try {
+            conn = dbManager.getConnection();
+            try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+                stmt.setInt(1, tradable ? 1 : 0);
+                stmt.setInt(2, currencyId);
+                int rows = stmt.executeUpdate();
+                if (rows > 0) {
+                    conn.commit();
+                    CardinalCooperativeCapitalismMarketEconomy.LOGGER.info("Currency {} tradable set to {}", currencyId, tradable);
+                    return true;
+                }
+            }
+            conn.rollback();
+        } catch (SQLException e) {
+            CardinalCooperativeCapitalismMarketEconomy.LOGGER.error("Failed to set tradable for currency: {}", currencyId, e);
+            if (conn != null) { try { conn.rollback(); } catch (SQLException ignored) {} }
+        } finally {
+            if (conn != null) { try { conn.close(); } catch (SQLException ignored) {} }
+        }
+        return false;
+    }
+
+    public Optional<Currency> getCurrency(int currencyId) {
+        String sql = String.format("SELECT * FROM %s WHERE id = ?", tables.getCurrencies());
+        Connection conn = null;
+        try {
+            conn = dbManager.getConnection();
+            try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+                stmt.setInt(1, currencyId);
+                try (ResultSet rs = stmt.executeQuery()) {
+                    if (rs.next()) {
+                        conn.commit();
+                        return Optional.of(mapCurrency(rs));
+                    }
+                }
+            }
+            conn.commit();
+        } catch (SQLException e) {
+            CardinalCooperativeCapitalismMarketEconomy.LOGGER.error("Failed to get currency: {}", currencyId, e);
+            if (conn != null) { try { conn.rollback(); } catch (SQLException ignored) {} }
+        } finally {
+            if (conn != null) { try { conn.close(); } catch (SQLException ignored) {} }
+        }
+        return Optional.empty();
+    }
+
+    public Optional<Currency> getCurrencyByName(String name) {
+        String sql = String.format("SELECT * FROM %s WHERE name = ?", tables.getCurrencies());
+        Connection conn = null;
+        try {
+            conn = dbManager.getConnection();
+            try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+                stmt.setString(1, name);
+                try (ResultSet rs = stmt.executeQuery()) {
+                    if (rs.next()) {
+                        conn.commit();
+                        return Optional.of(mapCurrency(rs));
+                    }
+                }
+            }
+            conn.commit();
+        } catch (SQLException e) {
+            CardinalCooperativeCapitalismMarketEconomy.LOGGER.error("Failed to get currency by name: {}", name, e);
+            if (conn != null) { try { conn.rollback(); } catch (SQLException ignored) {} }
+        } finally {
+            if (conn != null) { try { conn.close(); } catch (SQLException ignored) {} }
+        }
+        return Optional.empty();
+    }
+
+    public List<Currency> getAllCurrencies() {
+        String sql = String.format("SELECT * FROM %s", tables.getCurrencies());
+        List<Currency> currencies = new ArrayList<>();
+        Connection conn = null;
+        try {
+            conn = dbManager.getConnection();
+            try (Statement stmt = conn.createStatement();
+                 ResultSet rs = stmt.executeQuery(sql)) {
+                while (rs.next()) {
+                    currencies.add(mapCurrency(rs));
+                }
+            }
+            conn.commit();
+        } catch (SQLException e) {
+            CardinalCooperativeCapitalismMarketEconomy.LOGGER.error("Failed to get all currencies", e);
+            if (conn != null) { try { conn.rollback(); } catch (SQLException ignored) {} }
+        } finally {
+            if (conn != null) { try { conn.close(); } catch (SQLException ignored) {} }
+        }
+        return currencies;
+    }
+
+    private Currency mapCurrency(ResultSet rs) throws SQLException {
+        Currency currency = new Currency();
+        currency.setId(rs.getInt("id"));
+        currency.setName(rs.getString("name"));
+        currency.setSymbol(rs.getString("symbol"));
+        currency.setTradable(rs.getInt("tradable") == 1);
+        return currency;
+    }
+}

src/main/java/com/gvsds/tcme/manager/ExchangeRateManager.java

@@ -0,0 +1,134 @@
+package com.gvsds.tcme.manager;
+
+import com.gvsds.tcme.CardinalCooperativeCapitalismMarketEconomy;
+import com.gvsds.tcme.config.Config;
+import com.gvsds.tcme.database.DatabaseManager;
+
+import java.sql.Connection;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Statement;
+
+public class ExchangeRateManager {
+
+    private final DatabaseManager dbManager;
+    private final Config.Tables tables;
+    private final String exchangeRatesTable = "cme_exchange_rates";
+    private final boolean isMySQL;
+
+    public ExchangeRateManager(DatabaseManager dbManager, Config.Tables tables, boolean isMySQL) {
+        this.dbManager = dbManager;
+        this.tables = tables;
+        this.isMySQL = isMySQL;
+        initializeTable();
+    }
+
+    private void initializeTable() {
+        String textType = isMySQL ? "VARCHAR(255)" : "TEXT";
+        String autoIncrement = isMySQL ? "AUTO_INCREMENT" : "AUTOINCREMENT";
+        String engineClause = isMySQL ? "ENGINE=InnoDB DEFAULT CHARSET=utf8mb4" : "";
+
+        String sql = String.format("""
+            CREATE TABLE IF NOT EXISTS %s (
+                id INTEGER PRIMARY KEY %s,
+                currency_name %s NOT NULL UNIQUE,
+                rate REAL NOT NULL DEFAULT 1.0,
+                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+                updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+            ) %s
+            """, exchangeRatesTable, autoIncrement, textType, engineClause);
+
+        Connection conn = null;
+        try {
+            conn = dbManager.getConnection();
+            try (Statement stmt = conn.createStatement()) {
+                stmt.execute(sql);
+            }
+            conn.commit();
+        } catch (SQLException e) {
+            CardinalCooperativeCapitalismMarketEconomy.LOGGER.error("Failed to create exchange rates table", e);
+            if (conn != null) { try { conn.rollback(); } catch (SQLException ignored) {} }
+        } finally {
+            if (conn != null) { try { conn.close(); } catch (SQLException ignored) {} }
+        }
+    }
+
+    public void setRate(int currencyId, double rate) {
+        String sql;
+        if (isMySQL) {
+            sql = String.format(
+                "INSERT INTO %s (currency_name, rate, created_at, updated_at) VALUES (?, ?, CURRENT_TIMESTAMP, CURRENT_TIMESTAMP) " +
+                "ON DUPLICATE KEY UPDATE rate = VALUES(rate), updated_at = CURRENT_TIMESTAMP",
+                exchangeRatesTable
+            );
+        } else {
+            sql = String.format(
+                "INSERT INTO %s (currency_name, rate, created_at, updated_at) VALUES (?, ?, CURRENT_TIMESTAMP, CURRENT_TIMESTAMP) " +
+                "ON CONFLICT(currency_name) DO UPDATE SET rate = ?, updated_at = CURRENT_TIMESTAMP",
+                exchangeRatesTable
+            );
+        }
+
+        Connection conn = null;
+        try {
+            conn = dbManager.getConnection();
+            String nameSql = String.format("SELECT name FROM %s WHERE id = ?", tables.getCurrencies());
+            try (java.sql.PreparedStatement nameStmt = conn.prepareStatement(nameSql)) {
+                nameStmt.setInt(1, currencyId);
+                try (ResultSet rs = nameStmt.executeQuery()) {
+                    if (!rs.next()) {
+                        conn.rollback();
+                        return;
+                    }
+                    String currencyName = rs.getString("name");
+
+                    try (java.sql.PreparedStatement stmt = conn.prepareStatement(sql)) {
+                        stmt.setString(1, currencyName);
+                        stmt.setDouble(2, rate);
+                        if (!isMySQL) {
+                            stmt.setDouble(3, rate);
+                        }
+                        stmt.executeUpdate();
+                    }
+                }
+            }
+            conn.commit();
+        } catch (SQLException e) {
+            CardinalCooperativeCapitalismMarketEconomy.LOGGER.error("Failed to set exchange rate for currency: {}", currencyId, e);
+            if (conn != null) { try { conn.rollback(); } catch (SQLException ignored) {} }
+        } finally {
+            if (conn != null) { try { conn.close(); } catch (SQLException ignored) {} }
+        }
+    }
+
+    public double getRate(int currencyId) {
+        String sql = String.format("SELECT rate FROM %s WHERE currency_name = (SELECT name FROM %s WHERE id = ?)", exchangeRatesTable, tables.getCurrencies());
+        Connection conn = null;
+        try {
+            conn = dbManager.getConnection();
+            try (java.sql.PreparedStatement stmt = conn.prepareStatement(sql)) {
+                stmt.setInt(1, currencyId);
+                try (ResultSet rs = stmt.executeQuery()) {
+                    if (rs.next()) {
+                        double rate = rs.getDouble("rate");
+                        conn.commit();
+                        return rate;
+                    }
+                }
+            }
+            conn.commit();
+        } catch (SQLException e) {
+            CardinalCooperativeCapitalismMarketEconomy.LOGGER.error("Failed to get exchange rate for currency: {}", currencyId, e);
+            if (conn != null) { try { conn.rollback(); } catch (SQLException ignored) {} }
+        } finally {
+            if (conn != null) { try { conn.close(); } catch (SQLException ignored) {} }
+        }
+        return 1.0;
+    }
+
+    public double convert(double amount, int fromCurrencyId, int toCurrencyId) {
+        double fromRate = getRate(fromCurrencyId);
+        double toRate = getRate(toCurrencyId);
+        return amount * (fromRate / toRate);
+    }
+}

src/main/java/com/gvsds/tcme/manager/PaymentRequestManager.java

@@ -0,0 +1,254 @@
+package com.gvsds.tcme.manager;
+
+import com.gvsds.tcme.CardinalCooperativeCapitalismMarketEconomy;
+import com.gvsds.tcme.config.Config;
+import com.gvsds.tcme.database.DatabaseManager;
+import com.gvsds.tcme.model.PaymentRequest;
+
+import java.nio.ByteBuffer;
+import java.sql.*;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+import java.util.UUID;
+
+public class PaymentRequestManager {
+
+    private final DatabaseManager dbManager;
+    private final Config.Tables tables;
+    private final boolean isMySQL;
+
+    public PaymentRequestManager(DatabaseManager dbManager, Config.Tables tables, BalanceManager balanceManager, TransactionManager transactionManager, boolean isMySQL) {
+        this.dbManager = dbManager;
+        this.tables = tables;
+        this.isMySQL = isMySQL;
+    }
+
+    public Optional<PaymentRequest> createRequest(UUID fromUUID, UUID toUUID, int currencyId, double amount) {
+        if (amount <= 0) {
+            return Optional.empty();
+        }
+
+        String sql = String.format(
+            "INSERT INTO %s (from_uuid, to_uuid, currency_id, amount, status, created_at) VALUES (?, ?, ?, ?, 'pending', CURRENT_TIMESTAMP)",
+            tables.getPaymentRequests()
+        );
+
+        Connection conn = null;
+        try {
+            conn = dbManager.getConnection();
+            try (PreparedStatement stmt = conn.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS)) {
+                setUUID(stmt, 1, fromUUID);
+                setUUID(stmt, 2, toUUID);
+                stmt.setInt(3, currencyId);
+                stmt.setDouble(4, amount);
+                stmt.executeUpdate();
+
+                try (ResultSet rs = stmt.getGeneratedKeys()) {
+                    if (rs.next()) {
+                        PaymentRequest request = new PaymentRequest(fromUUID, toUUID, currencyId, amount);
+                        request.setId(rs.getInt(1));
+                        conn.commit();
+                        return Optional.of(request);
+                    }
+                }
+            }
+            conn.rollback();
+        } catch (SQLException e) {
+            CardinalCooperativeCapitalismMarketEconomy.LOGGER.error("Failed to create payment request", e);
+            if (conn != null) { try { conn.rollback(); } catch (SQLException ignored) {} }
+        } finally {
+            if (conn != null) { try { conn.close(); } catch (SQLException ignored) {} }
+        }
+        return Optional.empty();
+    }
+
+    public boolean acceptRequest(int requestId) {
+        String selectSql = String.format("SELECT * FROM %s WHERE id = ? AND status = 'pending'", tables.getPaymentRequests());
+        String updateSql = String.format("UPDATE %s SET status = 'completed' WHERE id = ?", tables.getPaymentRequests());
+        String insertTransactionSql = String.format(
+            "INSERT INTO %s (from_uuid, to_uuid, currency_id, amount, type, description, created_at) VALUES (?, ?, ?, ?, 'apay_accept', ?, CURRENT_TIMESTAMP)",
+            tables.getTransactions()
+        );
+
+        Connection conn = null;
+        try {
+            conn = dbManager.getConnection();
+
+            UUID fromUUID, toUUID;
+            int currencyId;
+            double amount;
+
+            try (PreparedStatement selectStmt = conn.prepareStatement(selectSql)) {
+                selectStmt.setInt(1, requestId);
+                try (ResultSet rs = selectStmt.executeQuery()) {
+                    if (!rs.next()) {
+                        conn.rollback();
+                        return false;
+                    }
+
+                    fromUUID = getUUIDFromBytes(rs.getBytes("from_uuid"));
+                    toUUID = getUUIDFromBytes(rs.getBytes("to_uuid"));
+                    currencyId = rs.getInt("currency_id");
+                    amount = rs.getDouble("amount");
+                }
+            }
+
+            BalanceManager bm = CardinalCooperativeCapitalismMarketEconomy.getBalanceManager();
+            double toBalance = bm.getBalance(conn, toUUID, currencyId);
+            if (toBalance < amount) {
+                conn.rollback();
+                return false;
+            }
+
+            bm.addBalance(conn, toUUID, currencyId, -amount);
+            bm.addBalance(conn, fromUUID, currencyId, amount);
+
+            try (PreparedStatement stmt = conn.prepareStatement(insertTransactionSql)) {
+                setUUID(stmt, 1, toUUID);
+                setUUID(stmt, 2, fromUUID);
+                stmt.setInt(3, currencyId);
+                stmt.setDouble(4, amount);
+                stmt.setString(5, "Accepted payment request #" + requestId);
+                stmt.executeUpdate();
+            }
+
+            try (PreparedStatement updateStmt = conn.prepareStatement(updateSql)) {
+                updateStmt.setInt(1, requestId);
+                updateStmt.executeUpdate();
+            }
+
+            conn.commit();
+            CardinalCooperativeCapitalismMarketEconomy.LOGGER.info("Payment request #{} accepted", requestId);
+            return true;
+        } catch (SQLException e) {
+            CardinalCooperativeCapitalismMarketEconomy.LOGGER.error("Failed to accept payment request", e);
+            if (conn != null) { try { conn.rollback(); } catch (SQLException ignored) {} }
+        } finally {
+            if (conn != null) { try { conn.close(); } catch (SQLException ignored) {} }
+        }
+        return false;
+    }
+
+    public boolean cancelRequest(int requestId) {
+        String sql = String.format("UPDATE %s SET status = 'cancelled' WHERE id = ? AND status = 'pending'", tables.getPaymentRequests());
+        Connection conn = null;
+        try {
+            conn = dbManager.getConnection();
+            try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+                stmt.setInt(1, requestId);
+                int rows = stmt.executeUpdate();
+                if (rows > 0) {
+                    conn.commit();
+                    return true;
+                }
+            }
+            conn.rollback();
+        } catch (SQLException e) {
+            CardinalCooperativeCapitalismMarketEconomy.LOGGER.error("Failed to cancel payment request", e);
+            if (conn != null) { try { conn.rollback(); } catch (SQLException ignored) {} }
+        } finally {
+            if (conn != null) { try { conn.close(); } catch (SQLException ignored) {} }
+        }
+        return false;
+    }
+
+    public boolean rejectRequest(int requestId) {
+        String sql = String.format("UPDATE %s SET status = 'rejected' WHERE id = ? AND status = 'pending'", tables.getPaymentRequests());
+        Connection conn = null;
+        try {
+            conn = dbManager.getConnection();
+            try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+                stmt.setInt(1, requestId);
+                int rows = stmt.executeUpdate();
+                if (rows > 0) {
+                    conn.commit();
+                    return true;
+                }
+            }
+            conn.rollback();
+        } catch (SQLException e) {
+            CardinalCooperativeCapitalismMarketEconomy.LOGGER.error("Failed to reject payment request", e);
+            if (conn != null) { try { conn.rollback(); } catch (SQLException ignored) {} }
+        } finally {
+            if (conn != null) { try { conn.close(); } catch (SQLException ignored) {} }
+        }
+        return false;
+    }
+
+    public Optional<PaymentRequest> getRequestById(int requestId) {
+        String sql = String.format("SELECT * FROM %s WHERE id = ?", tables.getPaymentRequests());
+        Connection conn = null;
+        try {
+            conn = dbManager.getConnection();
+            try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+                stmt.setInt(1, requestId);
+                try (ResultSet rs = stmt.executeQuery()) {
+                    if (rs.next()) {
+                        return Optional.of(mapPaymentRequest(rs));
+                    }
+                }
+            }
+            conn.commit();
+        } catch (SQLException e) {
+            CardinalCooperativeCapitalismMarketEconomy.LOGGER.error("Failed to get payment request by id", e);
+            if (conn != null) { try { conn.rollback(); } catch (SQLException ignored) {} }
+        } finally {
+            if (conn != null) { try { conn.close(); } catch (SQLException ignored) {} }
+        }
+        return Optional.empty();
+    }
+
+    public List<PaymentRequest> getPendingRequests(UUID playerUUID) {
+        String sql = String.format("SELECT * FROM %s WHERE to_uuid = ? AND status = 'pending'", tables.getPaymentRequests());
+        List<PaymentRequest> requests = new ArrayList<>();
+        Connection conn = null;
+        try {
+            conn = dbManager.getConnection();
+            try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+                setUUID(stmt, 1, playerUUID);
+                try (ResultSet rs = stmt.executeQuery()) {
+                    while (rs.next()) {
+                        requests.add(mapPaymentRequest(rs));
+                    }
+                }
+            }
+            conn.commit();
+        } catch (SQLException e) {
+            CardinalCooperativeCapitalismMarketEconomy.LOGGER.error("Failed to get pending requests", e);
+            if (conn != null) { try { conn.rollback(); } catch (SQLException ignored) {} }
+        } finally {
+            if (conn != null) { try { conn.close(); } catch (SQLException ignored) {} }
+        }
+        return requests;
+    }
+
+    private PaymentRequest mapPaymentRequest(ResultSet rs) throws SQLException {
+        PaymentRequest request = new PaymentRequest();
+        request.setId(rs.getInt("id"));
+        request.setFromUUID(getUUIDFromBytes(rs.getBytes("from_uuid")));
+        request.setToUUID(getUUIDFromBytes(rs.getBytes("to_uuid")));
+        request.setCurrencyId(rs.getInt("currency_id"));
+        request.setAmount(rs.getDouble("amount"));
+        request.setStatus(rs.getString("status"));
+        request.setCreatedAt(rs.getTimestamp("created_at"));
+        return request;
+    }
+
+    private void setUUID(PreparedStatement stmt, int index, UUID uuid) throws SQLException {
+        ByteBuffer buffer = ByteBuffer.wrap(new byte[16]);
+        buffer.putLong(uuid.getMostSignificantBits());
+        buffer.putLong(uuid.getLeastSignificantBits());
+        stmt.setBytes(index, buffer.array());
+    }
+
+    private UUID getUUIDFromBytes(byte[] bytes) {
+        if (bytes == null || bytes.length != 16) {
+            return null;
+        }
+        ByteBuffer buffer = ByteBuffer.wrap(bytes);
+        long mostSigBits = buffer.getLong();
+        long leastSigBits = buffer.getLong();
+        return new UUID(mostSigBits, leastSigBits);
+    }
+}

src/main/java/com/gvsds/tcme/manager/PlayerSettingsManager.java

@@ -0,0 +1,125 @@
+package com.gvsds.tcme.manager;
+
+import com.gvsds.tcme.CardinalCooperativeCapitalismMarketEconomy;
+import com.gvsds.tcme.config.Config;
+import com.gvsds.tcme.database.DatabaseManager;
+
+import java.nio.ByteBuffer;
+import java.sql.*;
+import java.util.Optional;
+import java.util.UUID;
+
+public class PlayerSettingsManager {
+
+    private final DatabaseManager dbManager;
+    private final Config.Tables tables;
+    private final boolean isMySQL;
+    private final String settingsTable;
+
+    public PlayerSettingsManager(DatabaseManager dbManager, Config.Tables tables, boolean isMySQL) {
+        this.dbManager = dbManager;
+        this.tables = tables;
+        this.isMySQL = isMySQL;
+        this.settingsTable = "cme_player_settings";
+        initializeTable();
+    }
+
+    private void initializeTable() {
+        String uuidType = isMySQL ? "BINARY(16)" : "BLOB";
+        String textType = isMySQL ? "VARCHAR(50)" : "TEXT";
+        String autoIncrement = isMySQL ? "AUTO_INCREMENT" : "AUTOINCREMENT";
+        String engineClause = isMySQL ? "ENGINE=InnoDB DEFAULT CHARSET=utf8mb4" : "";
+
+        String sql = String.format("""
+            CREATE TABLE IF NOT EXISTS %s (
+                id INTEGER PRIMARY KEY %s,
+                user_uuid %s NOT NULL UNIQUE,
+                language %s DEFAULT 'en_us',
+                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+                updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+            ) %s
+            """, settingsTable, autoIncrement, uuidType, textType, engineClause);
+
+        Connection conn = null;
+        try {
+            conn = dbManager.getConnection();
+            try (Statement stmt = conn.createStatement()) {
+                stmt.execute(sql);
+            }
+            conn.commit();
+        } catch (SQLException e) {
+            CardinalCooperativeCapitalismMarketEconomy.LOGGER.error("Failed to create player settings table", e);
+            if (conn != null) { try { conn.rollback(); } catch (SQLException ignored) {} }
+        } finally {
+            if (conn != null) { try { conn.close(); } catch (SQLException ignored) {} }
+        }
+    }
+
+    public void setLanguage(UUID playerUUID, String language) {
+        String sql;
+        if (isMySQL) {
+            sql = String.format(
+                "INSERT INTO %s (user_uuid, language, created_at, updated_at) VALUES (?, ?, CURRENT_TIMESTAMP, CURRENT_TIMESTAMP) " +
+                "ON DUPLICATE KEY UPDATE language = VALUES(language), updated_at = CURRENT_TIMESTAMP",
+                settingsTable
+            );
+        } else {
+            sql = String.format(
+                "INSERT INTO %s (user_uuid, language, created_at, updated_at) VALUES (?, ?, CURRENT_TIMESTAMP, CURRENT_TIMESTAMP) " +
+                "ON CONFLICT(user_uuid) DO UPDATE SET language = ?, updated_at = CURRENT_TIMESTAMP",
+                settingsTable
+            );
+        }
+
+        Connection conn = null;
+        try {
+            conn = dbManager.getConnection();
+            try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+                setUUID(stmt, 1, playerUUID);
+                stmt.setString(2, language);
+                if (!isMySQL) {
+                    stmt.setString(3, language);
+                }
+                stmt.executeUpdate();
+            }
+            conn.commit();
+        } catch (SQLException e) {
+            CardinalCooperativeCapitalismMarketEconomy.LOGGER.error("Failed to set language for player: {}", playerUUID, e);
+            if (conn != null) { try { conn.rollback(); } catch (SQLException ignored) {} }
+        } finally {
+            if (conn != null) { try { conn.close(); } catch (SQLException ignored) {} }
+        }
+    }
+
+    public Optional<String> getLanguage(UUID playerUUID) {
+        String sql = String.format("SELECT language FROM %s WHERE user_uuid = ?", settingsTable);
+        Connection conn = null;
+        try {
+            conn = dbManager.getConnection();
+            try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+                setUUID(stmt, 1, playerUUID);
+                try (ResultSet rs = stmt.executeQuery()) {
+                    if (rs.next()) {
+                        String lang = rs.getString("language");
+                        conn.commit();
+                        return Optional.of(lang);
+                    }
+                }
+            }
+            conn.commit();
+        } catch (SQLException e) {
+            CardinalCooperativeCapitalismMarketEconomy.LOGGER.error("Failed to get language for player: {}", playerUUID, e);
+            if (conn != null) { try { conn.rollback(); } catch (SQLException ignored) {} }
+        } finally {
+            if (conn != null) { try { conn.close(); } catch (SQLException ignored) {} }
+        }
+        return Optional.empty();
+    }
+
+    private void setUUID(PreparedStatement stmt, int index, UUID uuid) throws SQLException {
+        ByteBuffer buffer = ByteBuffer.wrap(new byte[16]);
+        buffer.putLong(uuid.getMostSignificantBits());
+        buffer.putLong(uuid.getLeastSignificantBits());
+        stmt.setBytes(index, buffer.array());
+    }
+}

src/main/java/com/gvsds/tcme/manager/TransactionManager.java

@@ -0,0 +1,141 @@
+package com.gvsds.tcme.manager;
+
+import com.gvsds.tcme.CardinalCooperativeCapitalismMarketEconomy;
+import com.gvsds.tcme.config.Config;
+import com.gvsds.tcme.database.DatabaseManager;
+
+import java.nio.ByteBuffer;
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.UUID;
+
+public class TransactionManager {
+
+    private final DatabaseManager dbManager;
+    private final Config.Tables tables;
+    private final boolean isMySQL;
+
+    public TransactionManager(DatabaseManager dbManager, Config.Tables tables, BalanceManager balanceManager, boolean isMySQL) {
+        this.dbManager = dbManager;
+        this.tables = tables;
+        this.isMySQL = isMySQL;
+    }
+
+    public boolean transfer(UUID fromUUID, UUID toUUID, int currencyId, double amount, String type, String description) {
+        if (amount <= 0) {
+            return false;
+        }
+
+        String sql = String.format(
+            "INSERT INTO %s (from_uuid, to_uuid, currency_id, amount, type, description, created_at) VALUES (?, ?, ?, ?, ?, ?, CURRENT_TIMESTAMP)",
+            tables.getTransactions()
+        );
+
+        String checkBalanceSql = String.format("SELECT balance FROM %s WHERE user_uuid = ? AND currency_id = ?", tables.getBalances());
+        String updateBalanceSql;
+        if (isMySQL) {
+            updateBalanceSql = String.format(
+                "INSERT INTO %s (user_uuid, currency_id, balance, created_at, updated_at) VALUES (?, ?, ?, CURRENT_TIMESTAMP, CURRENT_TIMESTAMP) " +
+                "ON DUPLICATE KEY UPDATE balance = VALUES(balance), updated_at = CURRENT_TIMESTAMP",
+                tables.getBalances()
+            );
+        } else {
+            updateBalanceSql = String.format(
+                "INSERT INTO %s (user_uuid, currency_id, balance, created_at, updated_at) VALUES (?, ?, ?, CURRENT_TIMESTAMP, CURRENT_TIMESTAMP) " +
+                "ON CONFLICT(user_uuid, currency_id) DO UPDATE SET balance = excluded.balance, updated_at = CURRENT_TIMESTAMP",
+                tables.getBalances()
+            );
+        }
+
+        Connection conn = null;
+        try {
+            conn = dbManager.getConnection();
+
+            double fromBalance;
+            try (PreparedStatement stmt = conn.prepareStatement(checkBalanceSql)) {
+                setUUID(stmt, 1, fromUUID);
+                stmt.setInt(2, currencyId);
+                try (ResultSet rs = stmt.executeQuery()) {
+                    if (rs.next()) {
+                        fromBalance = rs.getDouble("balance");
+                    } else {
+                        fromBalance = 0.0;
+                    }
+                }
+            }
+
+            if (fromBalance < amount) {
+                conn.rollback();
+                return false;
+            }
+
+            try (PreparedStatement stmt = conn.prepareStatement(updateBalanceSql)) {
+                setUUID(stmt, 1, fromUUID);
+                stmt.setInt(2, currencyId);
+                stmt.setDouble(3, fromBalance - amount);
+                stmt.executeUpdate();
+            }
+
+            double toBalance;
+            try (PreparedStatement stmt = conn.prepareStatement(checkBalanceSql)) {
+                setUUID(stmt, 1, toUUID);
+                stmt.setInt(2, currencyId);
+                try (ResultSet rs = stmt.executeQuery()) {
+                    if (rs.next()) {
+                        toBalance = rs.getDouble("balance");
+                    } else {
+                        toBalance = 0.0;
+                    }
+                }
+            }
+
+            try (PreparedStatement stmt = conn.prepareStatement(updateBalanceSql)) {
+                setUUID(stmt, 1, toUUID);
+                stmt.setInt(2, currencyId);
+                stmt.setDouble(3, toBalance + amount);
+                stmt.executeUpdate();
+            }
+
+            try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+                setUUID(stmt, 1, fromUUID);
+                setUUID(stmt, 2, toUUID);
+                stmt.setInt(3, currencyId);
+                stmt.setDouble(4, amount);
+                stmt.setString(5, type);
+                stmt.setString(6, description);
+                stmt.executeUpdate();
+            }
+
+            conn.commit();
+            CardinalCooperativeCapitalismMarketEconomy.LOGGER.info("Transfer: {} -> {} amount: {} currency: {}", fromUUID, toUUID, amount, currencyId);
+            return true;
+        } catch (SQLException e) {
+            CardinalCooperativeCapitalismMarketEconomy.LOGGER.error("Failed to process transfer", e);
+            if (conn != null) {
+                try {
+                    conn.rollback();
+                } catch (SQLException re) {
+                    CardinalCooperativeCapitalismMarketEconomy.LOGGER.error("Failed to rollback transfer", re);
+                }
+            }
+        } finally {
+            if (conn != null) {
+                try {
+                    conn.close();
+                } catch (SQLException ce) {
+                    CardinalCooperativeCapitalismMarketEconomy.LOGGER.error("Failed to close connection", ce);
+                }
+            }
+        }
+        return false;
+    }
+
+    private void setUUID(PreparedStatement stmt, int index, UUID uuid) throws SQLException {
+        ByteBuffer buffer = ByteBuffer.wrap(new byte[16]);
+        buffer.putLong(uuid.getMostSignificantBits());
+        buffer.putLong(uuid.getLeastSignificantBits());
+        stmt.setBytes(index, buffer.array());
+    }
+}

src/main/java/com/gvsds/tcme/model/Currency.java

@@ -0,0 +1,30 @@
+package com.gvsds.tcme.model;
+
+import java.util.UUID;
+
+public class Currency {
+    private int id;
+    private String name;
+    private String symbol;
+    private boolean tradable;
+    
+    public Currency() {}
+    
+    public Currency(String name, String symbol, boolean tradable) {
+        this.name = name;
+        this.symbol = symbol;
+        this.tradable = tradable;
+    }
+    
+    public int getId() { return id; }
+    public void setId(int id) { this.id = id; }
+    
+    public String getName() { return name; }
+    public void setName(String name) { this.name = name; }
+    
+    public String getSymbol() { return symbol; }
+    public void setSymbol(String symbol) { this.symbol = symbol; }
+    
+    public boolean isTradable() { return tradable; }
+    public void setTradable(boolean tradable) { this.tradable = tradable; }
+}

src/main/java/com/gvsds/tcme/model/PaymentRequest.java

@@ -0,0 +1,45 @@
+package com.gvsds.tcme.model;
+
+import java.sql.Timestamp;
+import java.util.UUID;
+
+public class PaymentRequest {
+    private int id;
+    private UUID fromUUID;
+    private UUID toUUID;
+    private int currencyId;
+    private double amount;
+    private String status;
+    private Timestamp createdAt;
+    
+    public PaymentRequest() {}
+    
+    public PaymentRequest(UUID fromUUID, UUID toUUID, int currencyId, double amount) {
+        this.fromUUID = fromUUID;
+        this.toUUID = toUUID;
+        this.currencyId = currencyId;
+        this.amount = amount;
+        this.status = "pending";
+    }
+    
+    public int getId() { return id; }
+    public void setId(int id) { this.id = id; }
+    
+    public UUID getFromUUID() { return fromUUID; }
+    public void setFromUUID(UUID fromUUID) { this.fromUUID = fromUUID; }
+    
+    public UUID getToUUID() { return toUUID; }
+    public void setToUUID(UUID toUUID) { this.toUUID = toUUID; }
+    
+    public int getCurrencyId() { return currencyId; }
+    public void setCurrencyId(int currencyId) { this.currencyId = currencyId; }
+    
+    public double getAmount() { return amount; }
+    public void setAmount(double amount) { this.amount = amount; }
+    
+    public String getStatus() { return status; }
+    public void setStatus(String status) { this.status = status; }
+    
+    public Timestamp getCreatedAt() { return createdAt; }
+    public void setCreatedAt(Timestamp createdAt) { this.createdAt = createdAt; }
+}

src/main/java/com/gvsds/tcme/model/PlayerBalance.java

@@ -0,0 +1,30 @@
+package com.gvsds.tcme.model;
+
+import java.util.UUID;
+
+public class PlayerBalance {
+    private int id;
+    private UUID userUUID;
+    private int currencyId;
+    private double balance;
+    
+    public PlayerBalance() {}
+    
+    public PlayerBalance(UUID userUUID, int currencyId, double balance) {
+        this.userUUID = userUUID;
+        this.currencyId = currencyId;
+        this.balance = balance;
+    }
+    
+    public int getId() { return id; }
+    public void setId(int id) { this.id = id; }
+    
+    public UUID getUserUUID() { return userUUID; }
+    public void setUserUUID(UUID userUUID) { this.userUUID = userUUID; }
+    
+    public int getCurrencyId() { return currencyId; }
+    public void setCurrencyId(int currencyId) { this.currencyId = currencyId; }
+    
+    public double getBalance() { return balance; }
+    public void setBalance(double balance) { this.balance = balance; }
+}

src/main/java/com/gvsds/tcme/model/Transaction.java

@@ -0,0 +1,50 @@
+package com.gvsds.tcme.model;
+
+import java.sql.Timestamp;
+import java.util.UUID;
+
+public class Transaction {
+    private int id;
+    private UUID fromUUID;
+    private UUID toUUID;
+    private int currencyId;
+    private double amount;
+    private String type;
+    private String description;
+    private Timestamp createdAt;
+    
+    public Transaction() {}
+    
+    public Transaction(UUID fromUUID, UUID toUUID, int currencyId, double amount, String type, String description) {
+        this.fromUUID = fromUUID;
+        this.toUUID = toUUID;
+        this.currencyId = currencyId;
+        this.amount = amount;
+        this.type = type;
+        this.description = description;
+    }
+    
+    public int getId() { return id; }
+    public void setId(int id) { this.id = id; }
+    
+    public UUID getFromUUID() { return fromUUID; }
+    public void setFromUUID(UUID fromUUID) { this.fromUUID = fromUUID; }
+    
+    public UUID getToUUID() { return toUUID; }
+    public void setToUUID(UUID toUUID) { this.toUUID = toUUID; }
+    
+    public int getCurrencyId() { return currencyId; }
+    public void setCurrencyId(int currencyId) { this.currencyId = currencyId; }
+    
+    public double getAmount() { return amount; }
+    public void setAmount(double amount) { this.amount = amount; }
+    
+    public String getType() { return type; }
+    public void setType(String type) { this.type = type; }
+    
+    public String getDescription() { return description; }
+    public void setDescription(String description) { this.description = description; }
+    
+    public Timestamp getCreatedAt() { return createdAt; }
+    public void setCreatedAt(Timestamp createdAt) { this.createdAt = createdAt; }
+}

src/main/java/com/gvsds/tcme/util/TextUtil.java

@@ -0,0 +1,80 @@
+package com.gvsds.tcme.util;
+
+import net.minecraft.text.MutableText;
+import net.minecraft.text.Text;
+import net.minecraft.util.Formatting;
+
+import java.util.*;
+
+public class TextUtil {
+
+    private static final Map<Character, Formatting> CODE_MAP = new HashMap<>();
+
+    static {
+        CODE_MAP.put('0', Formatting.BLACK);
+        CODE_MAP.put('1', Formatting.DARK_BLUE);
+        CODE_MAP.put('2', Formatting.DARK_GREEN);
+        CODE_MAP.put('3', Formatting.DARK_AQUA);
+        CODE_MAP.put('4', Formatting.DARK_RED);
+        CODE_MAP.put('5', Formatting.DARK_PURPLE);
+        CODE_MAP.put('6', Formatting.GOLD);
+        CODE_MAP.put('7', Formatting.GRAY);
+        CODE_MAP.put('8', Formatting.DARK_GRAY);
+        CODE_MAP.put('9', Formatting.BLUE);
+        CODE_MAP.put('a', Formatting.GREEN);
+        CODE_MAP.put('b', Formatting.AQUA);
+        CODE_MAP.put('c', Formatting.RED);
+        CODE_MAP.put('d', Formatting.LIGHT_PURPLE);
+        CODE_MAP.put('e', Formatting.YELLOW);
+        CODE_MAP.put('f', Formatting.WHITE);
+        CODE_MAP.put('k', Formatting.OBFUSCATED);
+        CODE_MAP.put('l', Formatting.BOLD);
+        CODE_MAP.put('m', Formatting.STRIKETHROUGH);
+        CODE_MAP.put('n', Formatting.UNDERLINE);
+        CODE_MAP.put('o', Formatting.ITALIC);
+    }
+
+    public static Text parseFormatting(String text) {
+        if (text == null || text.isEmpty()) return Text.empty();
+
+        MutableText result = null;
+        StringBuilder currentText = new StringBuilder();
+        Set<Formatting> currentFormats = new LinkedHashSet<>();
+
+        for (int i = 0; i < text.length(); i++) {
+            if (text.charAt(i) == '\u00A7' && i + 1 < text.length()) {
+                if (currentText.length() > 0) {
+                    MutableText part = Text.literal(currentText.toString());
+                    if (!currentFormats.isEmpty()) {
+                        part.formatted(currentFormats.toArray(new Formatting[0]));
+                    }
+                    result = result == null ? part : result.append(part);
+                    currentText = new StringBuilder();
+                }
+
+                char code = Character.toLowerCase(text.charAt(i + 1));
+                if (code == 'r') {
+                    currentFormats.clear();
+                } else {
+                    Formatting fmt = CODE_MAP.get(code);
+                    if (fmt != null) {
+                        currentFormats.add(fmt);
+                    }
+                }
+                i++;
+            } else {
+                currentText.append(text.charAt(i));
+            }
+        }
+
+        if (currentText.length() > 0) {
+            MutableText part = Text.literal(currentText.toString());
+            if (!currentFormats.isEmpty()) {
+                part.formatted(currentFormats.toArray(new Formatting[0]));
+            }
+            result = result == null ? part : result.append(part);
+        }
+
+        return result != null ? result : Text.empty();
+    }
+}

src/main/resources/assets/cardinal-cooperative-capitalism-market-economy/default_config.json

@@ -0,0 +1,12 @@
+{
+  "database": {
+    "type": "sqlite",
+    "sqlitePath": "./config/cardinal-economy/database",
+    "mysqlHost": "localhost",
+    "mysqlPort": 3306,
+    "mysqlDatabase": "cardinal_economy",
+    "mysqlUsername": "root",
+    "mysqlPassword": "",
+    "useSSL": false
+  }
+}

src/main/resources/cardinal-cooperative-capitalism-market-economy.mixins.json

@@ -0,0 +1,12 @@
+{
+	"required": true,
+	"package": "com.gvsds.tcme.mixin",
+	"compatibilityLevel": "JAVA_21",
+	"mixins": [],
+	"injectors": {
+		"defaultRequire": 1
+	},
+	"overwrites": {
+		"requireAnnotations": true
+	}
+}

src/main/resources/fabric.mod.json

@@ -0,0 +1,31 @@
+{
+	"schemaVersion": 1,
+	"id": "cardinal-cooperative-capitalism-market-economy",
+	"version": "${version}",
+	"name": "Cardinal Cooperative Capitalism: Market Economy",
+	"description": "A server-side economy mod with SQLite/MySQL database support",
+	"authors": [
+		"Me!"
+	],
+	"contact": {
+		"homepage": "https://fabricmc.net/",
+		"sources": "https://github.com/FabricMC/fabric-example-mod"
+	},
+	"license": "CC0-1.0",
+	"icon": "assets/cardinal-cooperative-capitalism-market-economy/icon.png",
+	"environment": "*",
+	"entrypoints": {
+		"main": [
+			"com.gvsds.tcme.CardinalCooperativeCapitalismMarketEconomy"
+		]
+	},
+	"mixins": [
+		"cardinal-cooperative-capitalism-market-economy.mixins.json"
+	],
+	"depends": {
+		"fabricloader": ">=0.19.2",
+		"minecraft": "~1.21.10",
+		"java": ">=21",
+		"fabric-api": "*"
+	}
+}