Implement PostgreSQL support and update database configuration: Migrate from SQLite to PostgreSQL by updating the Prisma schema, Docker configuration, and environment variables. Add PostgreSQL dependencies and adjust the database connection logic in the application. Enhance .gitignore to exclude PostgreSQL-related files and directories.

prisma/migrations.sqlite.backup/20251216153031_add_event_registration_points/migration.sql

@@ -0,0 +1,18 @@
+-- RedefineTables
+PRAGMA defer_foreign_keys=ON;
+PRAGMA foreign_keys=OFF;
+CREATE TABLE "new_SitePreferences" (
+    "id" TEXT NOT NULL PRIMARY KEY DEFAULT 'global',
+    "homeBackground" TEXT,
+    "eventsBackground" TEXT,
+    "leaderboardBackground" TEXT,
+    "challengesBackground" TEXT,
+    "eventRegistrationPoints" INTEGER NOT NULL DEFAULT 100,
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" DATETIME NOT NULL
+);
+INSERT INTO "new_SitePreferences" ("challengesBackground", "createdAt", "eventsBackground", "homeBackground", "id", "leaderboardBackground", "updatedAt") SELECT "challengesBackground", "createdAt", "eventsBackground", "homeBackground", "id", "leaderboardBackground", "updatedAt" FROM "SitePreferences";
+DROP TABLE "SitePreferences";
+ALTER TABLE "new_SitePreferences" RENAME TO "SitePreferences";
+PRAGMA foreign_keys=ON;
+PRAGMA defer_foreign_keys=OFF;