Revert to simple SQLite - remove PostgreSQL complexity

config.py

@@ -16,16 +16,8 @@ class Config:
     # SECRET_KEY is CRITICAL for sessions and CSRF
     SECRET_KEY = os.environ.get('SECRET_KEY') or os.environ.get('FLASK_SECRET_KEY') or 'dev-secret-key-change-in-production-2024'
     
-    # Database configuration
-    # Support both DATABASE_URL (Render, Railway) and SUPABASE_DB_URL formats
-    db_url = os.environ.get('DATABASE_URL') or os.environ.get('SUPABASE_DB_URL')
-    
-    # Fix postgres:// to postgresql:// (required by SQLAlchemy 1.4+)
-    if db_url and db_url.startswith('postgres://'):
-        db_url = db_url.replace('postgres://', 'postgresql://', 1)
-    
-    # Default to SQLite if no external database configured
-    SQLALCHEMY_DATABASE_URI = db_url or 'sqlite:///' + os.path.join(basedir, 'instance', 'app.db')
+    # Database configuration - Simple SQLite
+    SQLALCHEMY_DATABASE_URI = 'sqlite:///learning_path.db'
     SQLALCHEMY_TRACK_MODIFICATIONS = False
     
     # WTF CSRF Settings - Temporarily disabled due to HF Spaces session issues

requirements.txt

@@ -14,7 +14,6 @@ langchain==0.0.267
 openai>=1.0.0  # Using new OpenAI API
 tiktoken>=0.5.0  # Token counting for cost optimization
 Flask-SQLAlchemy==3.1.1
-psycopg2-binary>=2.9.9  # Postgres driver for production
 Flask-Login==0.6.3
 Flask-WTF==1.2.1
 Flask-Migrate==4.0.7

start.sh

@@ -17,47 +17,12 @@ fi
 echo "Initializing database..."
 python -c "
 from web_app import create_app
-from web_app.models import db, User
-from config import Config
-from sqlalchemy import text
-
-print(f'SECRET_KEY set: {bool(Config.SECRET_KEY)}')
-print(f'IS_PRODUCTION: {Config.IS_PRODUCTION}')
-print(f'SESSION_COOKIE_SECURE: {Config.SESSION_COOKIE_SECURE}')
-print(f'Database URI: {Config.SQLALCHEMY_DATABASE_URI[:50]}...')
+from web_app.models import db
 
 app = create_app()
 with app.app_context():
-    try:
-        # Try to query users table - if this works, DB is fine
-        user_count = User.query.count()
-        print(f'✅ Database working ({user_count} users)')
-    except Exception as check_error:
-        print(f'Database needs setup: {str(check_error)[:100]}')
-        
-        # Nuclear option: drop and recreate entire public schema
-        try:
-            print('Performing complete database reset...')
-            with db.engine.connect() as conn:
-                conn.execute(text('DROP SCHEMA public CASCADE'))
-                conn.commit()
-                print('  Schema dropped')
-                
-                conn.execute(text('CREATE SCHEMA public'))
-                conn.commit()
-                print('  Schema recreated')
-            
-            # Now create all tables
-            db.create_all()
-            print('✅ Database schema created successfully!')
-            
-            # Verify it works
-            user_count = User.query.count()
-            print(f'✅ Verified: Database has {user_count} users')
-            
-        except Exception as create_error:
-            print(f'❌ Database reset failed: {create_error}')
-            raise
+    db.create_all()
+    print('✅ Database initialized')
 "
 
 echo "Starting gunicorn server..."