Refactor database environment variable usage across workflows and application code

- Updated Gitea workflows to standardize on `DB_NAME` instead of `DB_DATABASE` for database name references.
- Modified deployment, backup, reset, and restore workflows to ensure consistent environment variable usage.
- Removed dotenv dependency and preload script, transitioning to environment variable management directly in scripts.
- Adjusted application code to utilize `DB_NAME` for database connections and logging.
- Enhanced README to reflect changes in environment variable configuration and usage.
- Cleaned up package.json scripts to remove unnecessary preload references.

.gitea/workflows/manual-db-restore.yml

@@ -25,13 +25,13 @@ jobs:
       DB_PORT: ${{ secrets.DB_PORT }}
       DB_USER: ${{ secrets.DB_USER }}
       DB_PASSWORD: ${{ secrets.DB_PASSWORD }}
-      DB_DATABASE: ${{ secrets.DB_DATABASE_PROD }}
+      DB_NAME: ${{ secrets.DB_DATABASE_PROD }}
       BACKUP_DIR: "/var/www/backups" # Define a dedicated directory for backups
 
     steps:
       - name: Validate Secrets and Inputs
         run: |
-          if [ -z "$DB_HOST" ] || [ -z "$DB_USER" ] || [ -z "$DB_PASSWORD" ] || [ -z "$DB_DATABASE" ]; then
+          if [ -z "$DB_HOST" ] || [ -z "$DB_USER" ] || [ -z "$DB_PASSWORD" ] || [ -z "$DB_NAME" ]; then
             echo "ERROR: One or more production database secrets are not set in Gitea repository settings."
             exit 1
           fi
@@ -66,10 +66,10 @@ jobs:
           echo "Dropping and recreating the production database..."
           # Connect as the superuser (postgres) to drop the database.
           # First, terminate all active connections to the database.
-          sudo -u postgres psql -c "SELECT pg_terminate_backend(pid) FROM pg_stat_activity WHERE datname = '${DB_DATABASE}';"
+          sudo -u postgres psql -c "SELECT pg_terminate_backend(pid) FROM pg_stat_activity WHERE datname = '${DB_NAME}';"
           # Now, drop and recreate it.
-          sudo -u postgres psql -c "DROP DATABASE IF EXISTS \"${DB_DATABASE}\";"
-          sudo -u postgres psql -c "CREATE DATABASE \"${DB_DATABASE}\" WITH OWNER = ${DB_USER};"
+          sudo -u postgres psql -c "DROP DATABASE IF EXISTS \"${DB_NAME}\";"
+          sudo -u postgres psql -c "CREATE DATABASE \"${DB_NAME}\" WITH OWNER = ${DB_USER};"
           echo "✅ Database dropped and recreated successfully."
 
       - name: Step 3 - Restore Database from Backup
@@ -84,7 +84,7 @@ jobs:
 
           # Uncompress the gzipped file and pipe the SQL commands directly into psql.
           # This is efficient as it doesn't require an intermediate uncompressed file.
-          gunzip < "$BACKUP_FILE_PATH" | PGPASSWORD="$DB_PASSWORD" psql -h "$DB_HOST" -p "$DB_PORT" -U "$DB_USER" -d "$DB_DATABASE"
+          gunzip < "$BACKUP_FILE_PATH" | PGPASSWORD="$DB_PASSWORD" psql -h "$DB_HOST" -p "$DB_PORT" -U "$DB_USER" -d "$DB_NAME"
 
           echo "✅ Database restore completed successfully."