Refactor user authentication and dashboard features

- Added `is_admin` field to User model for role management.
- Updated user context middleware to include current user in templates.
- Enhanced session management with improved debug middleware.
- Refactored dashboard view to fetch user-specific data and recent events.
- Improved login and registration templates for better user experience.
- Added admin routes with access control for admin users.
- Updated Docker configuration for better error logging and dependency management.
- Updated requirements to include new dependencies and specify versions.

app/models/user.py

@@ -1,18 +1,14 @@
-# Add is_admin field to User model if it's missing
-
-from sqlalchemy import Column, Integer, String, Boolean
-# ...existing imports...
+from sqlalchemy import Column, Integer, String, Boolean, DateTime
+from sqlalchemy.sql import func
+from ..db import Base
 
 class User(Base):
     __tablename__ = "users"
     
-    # ...existing fields...
     id = Column(Integer, primary_key=True, index=True)
     username = Column(String(50), unique=True, index=True)
     email = Column(String(100), unique=True, index=True)
-    password = Column(String(255))
-    
-    # Add is_admin field if it doesn't exist
+    password_hash = Column(String(255))  # Renamed from password to password_hash for clarity
     is_admin = Column(Boolean, default=False)
-    
-    # ...existing methods...
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())