diff --git a/.idea/compiler.xml b/.idea/compiler.xml
new file mode 100644
index 0000000..8a43039
--- /dev/null
+++ b/.idea/compiler.xml
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CompilerConfiguration">
+    <excludeFromCompile>
+      <directory url="file://$PROJECT_DIR$/src/main/resources/archetype-resources" includeSubdirectories="true" />
+    </excludeFromCompile>
+    <annotationProcessing>
+      <profile default="true" name="Default" enabled="true" />
+      <profile name="Maven default annotation processors profile" enabled="true">
+        <sourceOutputDir name="target/generated-sources/annotations" />
+        <sourceTestOutputDir name="target/generated-test-sources/test-annotations" />
+        <outputRelativeToContentRoot value="true" />
+        <module name="echo-backend" />
+      </profile>
+    </annotationProcessing>
+  </component>
+  <component name="JavacSettings">
+    <option name="ADDITIONAL_OPTIONS_OVERRIDE">
+      <module name="echo-backend" options="-parameters --add-opens jdk.compiler/com.sun.tools.javac.processing=ALL-UNNAMED" />
+    </option>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/dbnavigator.xml b/.idea/dbnavigator.xml
new file mode 100644
index 0000000..bd22aef
--- /dev/null
+++ b/.idea/dbnavigator.xml
@@ -0,0 +1,526 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="DBNavigator.Project.DataEditorManager">
+    <record-view-column-sorting-type value="BY_INDEX" />
+    <value-preview-text-wrapping value="false" />
+    <value-preview-pinned value="false" />
+  </component>
+  <component name="DBNavigator.Project.DatabaseBrowserManager">
+    <autoscroll-to-editor value="false" />
+    <autoscroll-from-editor value="true" />
+    <show-object-properties value="true" />
+    <loaded-nodes />
+  </component>
+  <component name="DBNavigator.Project.DatabaseConsoleManager">
+    <connection id="4ded7242-84d3-4adb-86b5-537d4d1b5740">
+      <console name="Connection" type="STANDARD" schema="mysql" session="Main" />
+    </connection>
+  </component>
+  <component name="DBNavigator.Project.DatabaseEditorStateManager">
+    <last-used-providers />
+  </component>
+  <component name="DBNavigator.Project.DatabaseFileManager">
+    <open-files />
+  </component>
+  <component name="DBNavigator.Project.DatasetFilterManager">
+    <filter-actions connection-id="4ded7242-84d3-4adb-86b5-537d4d1b5740" dataset="avocado.class_student" active-filter-id="" />
+    <filter-actions connection-id="4ded7242-84d3-4adb-86b5-537d4d1b5740" dataset="avocado.user" active-filter-id="" />
+  </component>
+  <component name="DBNavigator.Project.ExecutionManager">
+    <retain-sticky-names value="false" />
+  </component>
+  <component name="DBNavigator.Project.ObjectQuickFilterManager">
+    <last-used-operator value="EQUAL" />
+    <filters />
+  </component>
+  <component name="DBNavigator.Project.ParserDiagnosticsManager">
+    <diagnostics-history />
+  </component>
+  <component name="DBNavigator.Project.Settings">
+    <connections>
+      <connection id="4ded7242-84d3-4adb-86b5-537d4d1b5740" active="true" signed="true">
+        <database>
+          <name value="Connection" />
+          <description value="" />
+          <database-type value="MYSQL" />
+          <config-type value="BASIC" />
+          <database-version value="8.0" />
+          <driver-source value="BUNDLED" />
+          <driver-library value="" />
+          <driver value="" />
+          <url-type value="DATABASE" />
+          <host value="localhost" />
+          <port value="3306" />
+          <database value="mysql" />
+          <tns-folder value="" />
+          <tns-profile value="" />
+          <type value="USER_PASSWORD" />
+          <user value="root" />
+          <deprecated-pwd value="cm9vdA==" />
+        </database>
+        <properties>
+          <auto-commit value="false" />
+        </properties>
+        <ssh-settings>
+          <active value="false" />
+          <proxy-host value="" />
+          <proxy-port value="22" />
+          <proxy-user value="" />
+          <deprecated-proxy-pwd value="" />
+          <auth-type value="PASSWORD" />
+          <key-file value="" />
+          <key-passphrase value="" />
+        </ssh-settings>
+        <ssl-settings>
+          <active value="false" />
+          <certificate-authority-file value="" />
+          <client-certificate-file value="" />
+          <client-key-file value="" />
+        </ssl-settings>
+        <details>
+          <charset value="UTF-8" />
+          <session-management value="true" />
+          <ddl-file-binding value="true" />
+          <database-logging value="true" />
+          <connect-automatically value="true" />
+          <restore-workspace value="true" />
+          <restore-workspace-deep value="false" />
+          <environment-type value="default" />
+          <connectivity-timeout value="30" />
+          <idle-time-to-disconnect value="30" />
+          <idle-time-to-disconnect-pool value="5" />
+          <credential-expiry-time value="10" />
+          <max-connection-pool-size value="7" />
+          <alternative-statement-delimiter value="" />
+        </details>
+        <object-filters hide-empty-schemas="false" hide-pseudo-columns="false">
+          <object-type-filter>
+            <object-type name="SCHEMA" enabled="true" />
+            <object-type name="USER" enabled="true" />
+            <object-type name="ROLE" enabled="true" />
+            <object-type name="PRIVILEGE" enabled="true" />
+            <object-type name="CHARSET" enabled="true" />
+            <object-type name="TABLE" enabled="true" />
+            <object-type name="VIEW" enabled="true" />
+            <object-type name="MATERIALIZED_VIEW" enabled="true" />
+            <object-type name="NESTED_TABLE" enabled="true" />
+            <object-type name="COLUMN" enabled="true" />
+            <object-type name="INDEX" enabled="true" />
+            <object-type name="CONSTRAINT" enabled="true" />
+            <object-type name="DATASET_TRIGGER" enabled="true" />
+            <object-type name="DATABASE_TRIGGER" enabled="true" />
+            <object-type name="SYNONYM" enabled="true" />
+            <object-type name="SEQUENCE" enabled="true" />
+            <object-type name="PROCEDURE" enabled="true" />
+            <object-type name="FUNCTION" enabled="true" />
+            <object-type name="PACKAGE" enabled="true" />
+            <object-type name="TYPE" enabled="true" />
+            <object-type name="TYPE_ATTRIBUTE" enabled="true" />
+            <object-type name="ARGUMENT" enabled="true" />
+            <object-type name="DIMENSION" enabled="true" />
+            <object-type name="CLUSTER" enabled="true" />
+            <object-type name="DBLINK" enabled="true" />
+          </object-type-filter>
+          <object-name-filters />
+        </object-filters>
+      </connection>
+    </connections>
+    <browser-settings>
+      <general>
+        <display-mode value="TABBED" />
+        <navigation-history-size value="100" />
+        <show-object-details value="false" />
+      </general>
+      <filters>
+        <object-type-filter>
+          <object-type name="SCHEMA" enabled="true" />
+          <object-type name="USER" enabled="true" />
+          <object-type name="ROLE" enabled="true" />
+          <object-type name="PRIVILEGE" enabled="true" />
+          <object-type name="CHARSET" enabled="true" />
+          <object-type name="TABLE" enabled="true" />
+          <object-type name="VIEW" enabled="true" />
+          <object-type name="MATERIALIZED_VIEW" enabled="true" />
+          <object-type name="NESTED_TABLE" enabled="true" />
+          <object-type name="COLUMN" enabled="true" />
+          <object-type name="INDEX" enabled="true" />
+          <object-type name="CONSTRAINT" enabled="true" />
+          <object-type name="DATASET_TRIGGER" enabled="true" />
+          <object-type name="DATABASE_TRIGGER" enabled="true" />
+          <object-type name="SYNONYM" enabled="true" />
+          <object-type name="SEQUENCE" enabled="true" />
+          <object-type name="PROCEDURE" enabled="true" />
+          <object-type name="FUNCTION" enabled="true" />
+          <object-type name="PACKAGE" enabled="true" />
+          <object-type name="TYPE" enabled="true" />
+          <object-type name="TYPE_ATTRIBUTE" enabled="true" />
+          <object-type name="ARGUMENT" enabled="true" />
+          <object-type name="DIMENSION" enabled="true" />
+          <object-type name="CLUSTER" enabled="true" />
+          <object-type name="DBLINK" enabled="true" />
+        </object-type-filter>
+      </filters>
+      <sorting>
+        <object-type name="COLUMN" sorting-type="NAME" />
+        <object-type name="FUNCTION" sorting-type="NAME" />
+        <object-type name="PROCEDURE" sorting-type="NAME" />
+        <object-type name="ARGUMENT" sorting-type="POSITION" />
+        <object-type name="TYPE ATTRIBUTE" sorting-type="POSITION" />
+      </sorting>
+      <default-editors>
+        <object-type name="VIEW" editor-type="SELECTION" />
+        <object-type name="PACKAGE" editor-type="SELECTION" />
+        <object-type name="TYPE" editor-type="SELECTION" />
+      </default-editors>
+    </browser-settings>
+    <navigation-settings>
+      <lookup-filters>
+        <lookup-objects>
+          <object-type name="SCHEMA" enabled="true" />
+          <object-type name="USER" enabled="false" />
+          <object-type name="ROLE" enabled="false" />
+          <object-type name="PRIVILEGE" enabled="false" />
+          <object-type name="CHARSET" enabled="false" />
+          <object-type name="TABLE" enabled="true" />
+          <object-type name="VIEW" enabled="true" />
+          <object-type name="MATERIALIZED VIEW" enabled="true" />
+          <object-type name="INDEX" enabled="true" />
+          <object-type name="CONSTRAINT" enabled="true" />
+          <object-type name="DATASET TRIGGER" enabled="true" />
+          <object-type name="DATABASE TRIGGER" enabled="true" />
+          <object-type name="SYNONYM" enabled="false" />
+          <object-type name="SEQUENCE" enabled="true" />
+          <object-type name="PROCEDURE" enabled="true" />
+          <object-type name="FUNCTION" enabled="true" />
+          <object-type name="PACKAGE" enabled="true" />
+          <object-type name="TYPE" enabled="true" />
+          <object-type name="DIMENSION" enabled="false" />
+          <object-type name="CLUSTER" enabled="false" />
+          <object-type name="DBLINK" enabled="true" />
+        </lookup-objects>
+        <force-database-load value="false" />
+        <prompt-connection-selection value="true" />
+        <prompt-schema-selection value="true" />
+      </lookup-filters>
+    </navigation-settings>
+    <dataset-grid-settings>
+      <general>
+        <enable-zooming value="true" />
+        <enable-column-tooltip value="true" />
+      </general>
+      <sorting>
+        <nulls-first value="true" />
+        <max-sorting-columns value="4" />
+      </sorting>
+      <audit-columns>
+        <column-names value="" />
+        <visible value="true" />
+        <editable value="false" />
+      </audit-columns>
+    </dataset-grid-settings>
+    <dataset-editor-settings>
+      <text-editor-popup>
+        <active value="false" />
+        <active-if-empty value="false" />
+        <data-length-threshold value="100" />
+        <popup-delay value="1000" />
+      </text-editor-popup>
+      <values-actions-popup>
+        <show-popup-button value="true" />
+        <element-count-threshold value="1000" />
+        <data-length-threshold value="250" />
+      </values-actions-popup>
+      <general>
+        <fetch-block-size value="100" />
+        <fetch-timeout value="30" />
+        <trim-whitespaces value="true" />
+        <convert-empty-strings-to-null value="true" />
+        <select-content-on-cell-edit value="true" />
+        <large-value-preview-active value="true" />
+      </general>
+      <filters>
+        <prompt-filter-dialog value="true" />
+        <default-filter-type value="BASIC" />
+      </filters>
+      <qualified-text-editor text-length-threshold="300">
+        <content-types>
+          <content-type name="Text" enabled="true" />
+          <content-type name="Properties" enabled="true" />
+          <content-type name="XML" enabled="true" />
+          <content-type name="DTD" enabled="true" />
+          <content-type name="HTML" enabled="true" />
+          <content-type name="XHTML" enabled="true" />
+          <content-type name="Java" enabled="true" />
+          <content-type name="SQL" enabled="true" />
+          <content-type name="PL/SQL" enabled="true" />
+          <content-type name="JSON" enabled="true" />
+          <content-type name="JSON5" enabled="true" />
+          <content-type name="Groovy" enabled="true" />
+          <content-type name="AIDL" enabled="true" />
+          <content-type name="YAML" enabled="true" />
+          <content-type name="Manifest" enabled="true" />
+        </content-types>
+      </qualified-text-editor>
+      <record-navigation>
+        <navigation-target value="VIEWER" />
+      </record-navigation>
+    </dataset-editor-settings>
+    <code-editor-settings>
+      <general>
+        <show-object-navigation-gutter value="false" />
+        <show-spec-declaration-navigation-gutter value="true" />
+        <enable-spellchecking value="true" />
+        <enable-reference-spellchecking value="false" />
+      </general>
+      <confirmations>
+        <save-changes value="false" />
+        <revert-changes value="true" />
+      </confirmations>
+    </code-editor-settings>
+    <code-completion-settings>
+      <filters>
+        <basic-filter>
+          <filter-element type="RESERVED_WORD" id="keyword" selected="true" />
+          <filter-element type="RESERVED_WORD" id="function" selected="true" />
+          <filter-element type="RESERVED_WORD" id="parameter" selected="true" />
+          <filter-element type="RESERVED_WORD" id="datatype" selected="true" />
+          <filter-element type="RESERVED_WORD" id="exception" selected="true" />
+          <filter-element type="OBJECT" id="schema" selected="true" />
+          <filter-element type="OBJECT" id="role" selected="true" />
+          <filter-element type="OBJECT" id="user" selected="true" />
+          <filter-element type="OBJECT" id="privilege" selected="true" />
+          <user-schema>
+            <filter-element type="OBJECT" id="table" selected="true" />
+            <filter-element type="OBJECT" id="view" selected="true" />
+            <filter-element type="OBJECT" id="materialized view" selected="true" />
+            <filter-element type="OBJECT" id="index" selected="true" />
+            <filter-element type="OBJECT" id="constraint" selected="true" />
+            <filter-element type="OBJECT" id="trigger" selected="true" />
+            <filter-element type="OBJECT" id="synonym" selected="false" />
+            <filter-element type="OBJECT" id="sequence" selected="true" />
+            <filter-element type="OBJECT" id="procedure" selected="true" />
+            <filter-element type="OBJECT" id="function" selected="true" />
+            <filter-element type="OBJECT" id="package" selected="true" />
+            <filter-element type="OBJECT" id="type" selected="true" />
+            <filter-element type="OBJECT" id="dimension" selected="true" />
+            <filter-element type="OBJECT" id="cluster" selected="true" />
+            <filter-element type="OBJECT" id="dblink" selected="true" />
+          </user-schema>
+          <public-schema>
+            <filter-element type="OBJECT" id="table" selected="false" />
+            <filter-element type="OBJECT" id="view" selected="false" />
+            <filter-element type="OBJECT" id="materialized view" selected="false" />
+            <filter-element type="OBJECT" id="index" selected="false" />
+            <filter-element type="OBJECT" id="constraint" selected="false" />
+            <filter-element type="OBJECT" id="trigger" selected="false" />
+            <filter-element type="OBJECT" id="synonym" selected="false" />
+            <filter-element type="OBJECT" id="sequence" selected="false" />
+            <filter-element type="OBJECT" id="procedure" selected="false" />
+            <filter-element type="OBJECT" id="function" selected="false" />
+            <filter-element type="OBJECT" id="package" selected="false" />
+            <filter-element type="OBJECT" id="type" selected="false" />
+            <filter-element type="OBJECT" id="dimension" selected="false" />
+            <filter-element type="OBJECT" id="cluster" selected="false" />
+            <filter-element type="OBJECT" id="dblink" selected="false" />
+          </public-schema>
+          <any-schema>
+            <filter-element type="OBJECT" id="table" selected="true" />
+            <filter-element type="OBJECT" id="view" selected="true" />
+            <filter-element type="OBJECT" id="materialized view" selected="true" />
+            <filter-element type="OBJECT" id="index" selected="true" />
+            <filter-element type="OBJECT" id="constraint" selected="true" />
+            <filter-element type="OBJECT" id="trigger" selected="true" />
+            <filter-element type="OBJECT" id="synonym" selected="true" />
+            <filter-element type="OBJECT" id="sequence" selected="true" />
+            <filter-element type="OBJECT" id="procedure" selected="true" />
+            <filter-element type="OBJECT" id="function" selected="true" />
+            <filter-element type="OBJECT" id="package" selected="true" />
+            <filter-element type="OBJECT" id="type" selected="true" />
+            <filter-element type="OBJECT" id="dimension" selected="true" />
+            <filter-element type="OBJECT" id="cluster" selected="true" />
+            <filter-element type="OBJECT" id="dblink" selected="true" />
+          </any-schema>
+        </basic-filter>
+        <extended-filter>
+          <filter-element type="RESERVED_WORD" id="keyword" selected="true" />
+          <filter-element type="RESERVED_WORD" id="function" selected="true" />
+          <filter-element type="RESERVED_WORD" id="parameter" selected="true" />
+          <filter-element type="RESERVED_WORD" id="datatype" selected="true" />
+          <filter-element type="RESERVED_WORD" id="exception" selected="true" />
+          <filter-element type="OBJECT" id="schema" selected="true" />
+          <filter-element type="OBJECT" id="user" selected="true" />
+          <filter-element type="OBJECT" id="role" selected="true" />
+          <filter-element type="OBJECT" id="privilege" selected="true" />
+          <user-schema>
+            <filter-element type="OBJECT" id="table" selected="true" />
+            <filter-element type="OBJECT" id="view" selected="true" />
+            <filter-element type="OBJECT" id="materialized view" selected="true" />
+            <filter-element type="OBJECT" id="index" selected="true" />
+            <filter-element type="OBJECT" id="constraint" selected="true" />
+            <filter-element type="OBJECT" id="trigger" selected="true" />
+            <filter-element type="OBJECT" id="synonym" selected="true" />
+            <filter-element type="OBJECT" id="sequence" selected="true" />
+            <filter-element type="OBJECT" id="procedure" selected="true" />
+            <filter-element type="OBJECT" id="function" selected="true" />
+            <filter-element type="OBJECT" id="package" selected="true" />
+            <filter-element type="OBJECT" id="type" selected="true" />
+            <filter-element type="OBJECT" id="dimension" selected="true" />
+            <filter-element type="OBJECT" id="cluster" selected="true" />
+            <filter-element type="OBJECT" id="dblink" selected="true" />
+          </user-schema>
+          <public-schema>
+            <filter-element type="OBJECT" id="table" selected="true" />
+            <filter-element type="OBJECT" id="view" selected="true" />
+            <filter-element type="OBJECT" id="materialized view" selected="true" />
+            <filter-element type="OBJECT" id="index" selected="true" />
+            <filter-element type="OBJECT" id="constraint" selected="true" />
+            <filter-element type="OBJECT" id="trigger" selected="true" />
+            <filter-element type="OBJECT" id="synonym" selected="true" />
+            <filter-element type="OBJECT" id="sequence" selected="true" />
+            <filter-element type="OBJECT" id="procedure" selected="true" />
+            <filter-element type="OBJECT" id="function" selected="true" />
+            <filter-element type="OBJECT" id="package" selected="true" />
+            <filter-element type="OBJECT" id="type" selected="true" />
+            <filter-element type="OBJECT" id="dimension" selected="true" />
+            <filter-element type="OBJECT" id="cluster" selected="true" />
+            <filter-element type="OBJECT" id="dblink" selected="true" />
+          </public-schema>
+          <any-schema>
+            <filter-element type="OBJECT" id="table" selected="true" />
+            <filter-element type="OBJECT" id="view" selected="true" />
+            <filter-element type="OBJECT" id="materialized view" selected="true" />
+            <filter-element type="OBJECT" id="index" selected="true" />
+            <filter-element type="OBJECT" id="constraint" selected="true" />
+            <filter-element type="OBJECT" id="trigger" selected="true" />
+            <filter-element type="OBJECT" id="synonym" selected="true" />
+            <filter-element type="OBJECT" id="sequence" selected="true" />
+            <filter-element type="OBJECT" id="procedure" selected="true" />
+            <filter-element type="OBJECT" id="function" selected="true" />
+            <filter-element type="OBJECT" id="package" selected="true" />
+            <filter-element type="OBJECT" id="type" selected="true" />
+            <filter-element type="OBJECT" id="dimension" selected="true" />
+            <filter-element type="OBJECT" id="cluster" selected="true" />
+            <filter-element type="OBJECT" id="dblink" selected="true" />
+          </any-schema>
+        </extended-filter>
+      </filters>
+      <sorting enabled="true">
+        <sorting-element type="RESERVED_WORD" id="keyword" />
+        <sorting-element type="RESERVED_WORD" id="datatype" />
+        <sorting-element type="OBJECT" id="column" />
+        <sorting-element type="OBJECT" id="table" />
+        <sorting-element type="OBJECT" id="view" />
+        <sorting-element type="OBJECT" id="materialized view" />
+        <sorting-element type="OBJECT" id="index" />
+        <sorting-element type="OBJECT" id="constraint" />
+        <sorting-element type="OBJECT" id="trigger" />
+        <sorting-element type="OBJECT" id="synonym" />
+        <sorting-element type="OBJECT" id="sequence" />
+        <sorting-element type="OBJECT" id="procedure" />
+        <sorting-element type="OBJECT" id="function" />
+        <sorting-element type="OBJECT" id="package" />
+        <sorting-element type="OBJECT" id="type" />
+        <sorting-element type="OBJECT" id="dimension" />
+        <sorting-element type="OBJECT" id="cluster" />
+        <sorting-element type="OBJECT" id="dblink" />
+        <sorting-element type="OBJECT" id="schema" />
+        <sorting-element type="OBJECT" id="role" />
+        <sorting-element type="OBJECT" id="user" />
+        <sorting-element type="RESERVED_WORD" id="function" />
+        <sorting-element type="RESERVED_WORD" id="parameter" />
+      </sorting>
+      <format>
+        <enforce-code-style-case value="true" />
+      </format>
+    </code-completion-settings>
+    <execution-engine-settings>
+      <statement-execution>
+        <fetch-block-size value="100" />
+        <execution-timeout value="20" />
+        <debug-execution-timeout value="600" />
+        <focus-result value="false" />
+        <prompt-execution value="false" />
+      </statement-execution>
+      <script-execution>
+        <command-line-interfaces />
+        <execution-timeout value="300" />
+      </script-execution>
+      <method-execution>
+        <execution-timeout value="30" />
+        <debug-execution-timeout value="600" />
+        <parameter-history-size value="10" />
+      </method-execution>
+    </execution-engine-settings>
+    <operation-settings>
+      <transactions>
+        <uncommitted-changes>
+          <on-project-close value="ASK" />
+          <on-disconnect value="ASK" />
+          <on-autocommit-toggle value="ASK" />
+        </uncommitted-changes>
+        <multiple-uncommitted-changes>
+          <on-commit value="ASK" />
+          <on-rollback value="ASK" />
+        </multiple-uncommitted-changes>
+      </transactions>
+      <session-browser>
+        <disconnect-session value="ASK" />
+        <kill-session value="ASK" />
+        <reload-on-filter-change value="false" />
+      </session-browser>
+      <compiler>
+        <compile-type value="KEEP" />
+        <compile-dependencies value="ASK" />
+        <always-show-controls value="false" />
+      </compiler>
+      <debugger>
+        <debugger-type value="ASK" />
+        <use-generic-runners value="true" />
+      </debugger>
+    </operation-settings>
+    <ddl-file-settings>
+      <extensions>
+        <mapping file-type-id="VIEW" extensions="vw" />
+        <mapping file-type-id="TRIGGER" extensions="trg" />
+        <mapping file-type-id="PROCEDURE" extensions="prc" />
+        <mapping file-type-id="FUNCTION" extensions="fnc" />
+        <mapping file-type-id="PACKAGE" extensions="pkg" />
+        <mapping file-type-id="PACKAGE_SPEC" extensions="pks" />
+        <mapping file-type-id="PACKAGE_BODY" extensions="pkb" />
+        <mapping file-type-id="TYPE" extensions="tpe" />
+        <mapping file-type-id="TYPE_SPEC" extensions="tps" />
+        <mapping file-type-id="TYPE_BODY" extensions="tpb" />
+      </extensions>
+      <general>
+        <lookup-ddl-files value="true" />
+        <create-ddl-files value="false" />
+        <synchronize-ddl-files value="true" />
+        <use-qualified-names value="false" />
+        <make-scripts-rerunnable value="true" />
+      </general>
+    </ddl-file-settings>
+    <general-settings>
+      <regional-settings>
+        <date-format value="MEDIUM" />
+        <number-format value="UNGROUPED" />
+        <locale value="SYSTEM_DEFAULT" />
+        <use-custom-formats value="false" />
+      </regional-settings>
+      <environment>
+        <environment-types>
+          <environment-type id="development" name="Development" description="Development environment" color="-2430209/-12296320" readonly-code="false" readonly-data="false" />
+          <environment-type id="integration" name="Integration" description="Integration environment" color="-2621494/-12163514" readonly-code="true" readonly-data="false" />
+          <environment-type id="production" name="Production" description="Productive environment" color="-11574/-10271420" readonly-code="true" readonly-data="true" />
+          <environment-type id="other" name="Other" description="" color="-1576/-10724543" readonly-code="false" readonly-data="false" />
+        </environment-types>
+        <visibility-settings>
+          <connection-tabs value="true" />
+          <dialog-headers value="true" />
+          <object-editor-tabs value="true" />
+          <script-editor-tabs value="false" />
+          <execution-result-tabs value="true" />
+        </visibility-settings>
+      </environment>
+    </general-settings>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/encodings.xml b/.idea/encodings.xml
new file mode 100644
index 0000000..aa00ffa
--- /dev/null
+++ b/.idea/encodings.xml
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding">
+    <file url="file://$PROJECT_DIR$/src/main/java" charset="UTF-8" />
+    <file url="file://$PROJECT_DIR$/src/main/resources" charset="UTF-8" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/jarRepositories.xml b/.idea/jarRepositories.xml
new file mode 100644
index 0000000..712ab9d
--- /dev/null
+++ b/.idea/jarRepositories.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RemoteRepositoriesConfiguration">
+    <remote-repository>
+      <option name="id" value="central" />
+      <option name="name" value="Central Repository" />
+      <option name="url" value="https://repo.maven.apache.org/maven2" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="central" />
+      <option name="name" value="Maven Central repository" />
+      <option name="url" value="https://repo1.maven.org/maven2" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="jboss.community" />
+      <option name="name" value="JBoss Community repository" />
+      <option name="url" value="https://repository.jboss.org/nexus/content/repositories/public/" />
+    </remote-repository>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
new file mode 100644
index 0000000..82dbec8
--- /dev/null
+++ b/.idea/misc.xml
@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="MavenProjectsManager">
+    <option name="originalFiles">
+      <list>
+        <option value="$PROJECT_DIR$/pom.xml" />
+      </list>
+    </option>
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_17" default="true" project-jdk-name="17" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/uiDesigner.xml b/.idea/uiDesigner.xml
new file mode 100644
index 0000000..2b63946
--- /dev/null
+++ b/.idea/uiDesigner.xml
@@ -0,0 +1,124 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Palette2">
+    <group name="Swing">
+      <item class="com.intellij.uiDesigner.HSpacer" tooltip-text="Horizontal Spacer" icon="/com/intellij/uiDesigner/icons/hspacer.svg" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="1" hsize-policy="6" anchor="0" fill="1" />
+      </item>
+      <item class="com.intellij.uiDesigner.VSpacer" tooltip-text="Vertical Spacer" icon="/com/intellij/uiDesigner/icons/vspacer.svg" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="1" anchor="0" fill="2" />
+      </item>
+      <item class="javax.swing.JPanel" icon="/com/intellij/uiDesigner/icons/panel.svg" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="3" hsize-policy="3" anchor="0" fill="3" />
+      </item>
+      <item class="javax.swing.JScrollPane" icon="/com/intellij/uiDesigner/icons/scrollPane.svg" removable="false" auto-create-binding="false" can-attach-label="true">
+        <default-constraints vsize-policy="7" hsize-policy="7" anchor="0" fill="3" />
+      </item>
+      <item class="javax.swing.JButton" icon="/com/intellij/uiDesigner/icons/button.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="3" anchor="0" fill="1" />
+        <initial-values>
+          <property name="text" value="Button" />
+        </initial-values>
+      </item>
+      <item class="javax.swing.JRadioButton" icon="/com/intellij/uiDesigner/icons/radioButton.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="3" anchor="8" fill="0" />
+        <initial-values>
+          <property name="text" value="RadioButton" />
+        </initial-values>
+      </item>
+      <item class="javax.swing.JCheckBox" icon="/com/intellij/uiDesigner/icons/checkBox.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="3" anchor="8" fill="0" />
+        <initial-values>
+          <property name="text" value="CheckBox" />
+        </initial-values>
+      </item>
+      <item class="javax.swing.JLabel" icon="/com/intellij/uiDesigner/icons/label.svg" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="0" anchor="8" fill="0" />
+        <initial-values>
+          <property name="text" value="Label" />
+        </initial-values>
+      </item>
+      <item class="javax.swing.JTextField" icon="/com/intellij/uiDesigner/icons/textField.svg" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1">
+          <preferred-size width="150" height="-1" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JPasswordField" icon="/com/intellij/uiDesigner/icons/passwordField.svg" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1">
+          <preferred-size width="150" height="-1" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JFormattedTextField" icon="/com/intellij/uiDesigner/icons/formattedTextField.svg" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1">
+          <preferred-size width="150" height="-1" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JTextArea" icon="/com/intellij/uiDesigner/icons/textArea.svg" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JTextPane" icon="/com/intellij/uiDesigner/icons/textPane.svg" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JEditorPane" icon="/com/intellij/uiDesigner/icons/editorPane.svg" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JComboBox" icon="/com/intellij/uiDesigner/icons/comboBox.svg" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="0" hsize-policy="2" anchor="8" fill="1" />
+      </item>
+      <item class="javax.swing.JTable" icon="/com/intellij/uiDesigner/icons/table.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JList" icon="/com/intellij/uiDesigner/icons/list.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="2" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JTree" icon="/com/intellij/uiDesigner/icons/tree.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JTabbedPane" icon="/com/intellij/uiDesigner/icons/tabbedPane.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="3" hsize-policy="3" anchor="0" fill="3">
+          <preferred-size width="200" height="200" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JSplitPane" icon="/com/intellij/uiDesigner/icons/splitPane.svg" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="3" hsize-policy="3" anchor="0" fill="3">
+          <preferred-size width="200" height="200" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JSpinner" icon="/com/intellij/uiDesigner/icons/spinner.svg" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1" />
+      </item>
+      <item class="javax.swing.JSlider" icon="/com/intellij/uiDesigner/icons/slider.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1" />
+      </item>
+      <item class="javax.swing.JSeparator" icon="/com/intellij/uiDesigner/icons/separator.svg" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3" />
+      </item>
+      <item class="javax.swing.JProgressBar" icon="/com/intellij/uiDesigner/icons/progressbar.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="0" fill="1" />
+      </item>
+      <item class="javax.swing.JToolBar" icon="/com/intellij/uiDesigner/icons/toolbar.svg" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="0" fill="1">
+          <preferred-size width="-1" height="20" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JToolBar$Separator" icon="/com/intellij/uiDesigner/icons/toolbarSeparator.svg" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="0" anchor="0" fill="1" />
+      </item>
+      <item class="javax.swing.JScrollBar" icon="/com/intellij/uiDesigner/icons/scrollbar.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="0" anchor="0" fill="2" />
+      </item>
+    </group>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..94a25f7
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/workspace.xml b/.idea/workspace.xml
new file mode 100644
index 0000000..0d5980a
--- /dev/null
+++ b/.idea/workspace.xml
@@ -0,0 +1,61 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="AutoImportSettings">
+    <option name="autoReloadType" value="SELECTIVE" />
+  </component>
+  <component name="ChangeListManager">
+    <list default="true" id="f008fe30-0711-42e2-bb33-17dcfdbad387" name="Changes" comment="" />
+    <option name="SHOW_DIALOG" value="false" />
+    <option name="HIGHLIGHT_CONFLICTS" value="true" />
+    <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
+    <option name="LAST_RESOLUTION" value="IGNORE" />
+  </component>
+  <component name="FileTemplateManagerImpl">
+    <option name="RECENT_TEMPLATES">
+      <list>
+        <option value="Class" />
+      </list>
+    </option>
+  </component>
+  <component name="Git.Settings">
+    <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" />
+  </component>
+  <component name="MarkdownSettingsMigration">
+    <option name="stateVersion" value="1" />
+  </component>
+  <component name="MavenImportPreferences">
+    <option name="importingSettings">
+      <MavenImportingSettings>
+        <option name="workspaceImportEnabled" value="true" />
+      </MavenImportingSettings>
+    </option>
+  </component>
+  <component name="ProjectId" id="2vZNfNTEFyHApdxmHZ7Y0rlJjKB" />
+  <component name="ProjectLevelVcsManager" settingsEditedManually="true" />
+  <component name="ProjectViewState">
+    <option name="hideEmptyMiddlePackages" value="true" />
+    <option name="showLibraryContents" value="true" />
+  </component>
+  <component name="PropertiesComponent"><![CDATA[{
+  "keyToString": {
+    "RunOnceActivity.OpenProjectViewOnStart": "true",
+    "RunOnceActivity.ShowReadmeOnStart": "true"
+  }
+}]]></component>
+  <component name="RecentsManager">
+    <key name="MoveFile.RECENT_KEYS">
+      <recent name="D:\study\学习资源\大三下\school\echo-backend\src\main\resources\mapper" />
+    </key>
+  </component>
+  <component name="SpellCheckerSettings" RuntimeDictionaries="0" Folders="0" CustomDictionaries="0" DefaultDictionary="application-level" UseSingleDictionary="true" transferred="true" />
+  <component name="TaskManager">
+    <task active="true" id="Default" summary="Default task">
+      <changelist id="f008fe30-0711-42e2-bb33-17dcfdbad387" name="Changes" comment="" />
+      <created>1744348740342</created>
+      <option name="number" value="Default" />
+      <option name="presentableId" value="Default" />
+      <updated>1744348740342</updated>
+    </task>
+    <servers />
+  </component>
+</project>
\ No newline at end of file