Precompile H2 helper functions

app/src/main/kotlin/org/gameyfin/db/h2/H2Aliases.kt

@@ -0,0 +1,30 @@
+package org.gameyfin.db.h2
+
+import java.sql.Connection
+import java.sql.SQLException
+
+/**
+ * H2 helper methods exposed as SQL ALIASes.
+ * <p>
+ * Kotlin implementation replacing the former Java version so a JDK (javac) is not
+ * required at runtime for defining aliases in migration scripts.
+ */
+object H2Aliases {
+    /**
+     * Renames a constraint if it exists, swallowing only H2 error code 90057 (constraint not found).
+     */
+    @JvmStatic
+    @Throws(SQLException::class)
+    fun renameConstraintIfExists(conn: Connection, table: String, oldName: String, newName: String) {
+        conn.createStatement().use { st ->
+            try {
+                st.execute("ALTER TABLE $table RENAME CONSTRAINT $oldName TO $newName")
+            } catch (e: SQLException) {
+                if (e.errorCode != 90057) { // ignore only 'constraint not found'
+                    throw e
+                }
+            }
+        }
+    }
+}
+

app/src/main/resources/db/migration/V2.1.0.1__Drop_game_image_uniques_and_rename_constraints.sql

@@ -9,24 +9,10 @@
 
 /******************************************************************************************
  * Helper: Idempotent constraint rename for H2
- * H2 does not support RENAME CONSTRAINT IF EXISTS, so we create a Java alias that
+ * (Updated) Use precompiled Java class instead of inline Java to avoid needing 'javac' at runtime.
- * executes a rename and suppresses error 90057 (constraint not found).
+ * Class: org.gameyfin.db.h2.H2Aliases.renameConstraintIfExists(Connection,String,String,String)
- * NOTE: Do not declare method as public static; H2 wraps it and adds modifiers itself.
  ******************************************************************************************/
-CREATE ALIAS IF NOT EXISTS RENAME_CONSTRAINT_IF_EXISTS AS
+CREATE ALIAS IF NOT EXISTS RENAME_CONSTRAINT_IF_EXISTS FOR "org.gameyfin.db.h2.H2Aliases.renameConstraintIfExists";
-$$
-import java.sql.*;
-@CODE
-void run(Connection conn, String table, String oldName, String newName) throws SQLException {
-    try (Statement st = conn.createStatement()) {
-        st.execute("ALTER TABLE " + table + " RENAME CONSTRAINT " + oldName + " TO " + newName);
-    } catch (SQLException e) {
-        if (e.getErrorCode() != 90057) { // ignore only 'constraint not found'
-            throw e;
-        }
-    }
-}
-$$;
 
 /******************************************************************************************
  * 1. Drop the two unwanted unique constraints on GAME