Fix SQLite migration issues by removing non-constant defaults

Changes:
- Removed server_default with CURRENT_TIMESTAMP from User model (SQLite doesn't support non-constant defaults in ALTER TABLE)
- Updated migrations 002 and 003 to add datetime columns without server defaults
- Added manual timestamp updates using SQLite's datetime('now') function in migrations
- Modified User model to handle timestamps in Python code instead of database defaults
- Updated profile routes to manually set updated_at timestamps on profile changes
- Enhanced User model __init__ to set default timestamps for new users

This resolves the 'Cannot add a column with non-constant default' SQLite error
while maintaining proper timestamp functionality.

alembic/versions/002_add_profile_fields.py

@@ -27,7 +27,7 @@ def column_exists(table_name, column_name):
 
 
 def upgrade() -> None:
-    # List of columns to add
+    # List of columns to add (without server defaults for SQLite compatibility)
     columns_to_add = [
         ('first_name', sa.Column('first_name', sa.String(), nullable=True)),
         ('last_name', sa.Column('last_name', sa.String(), nullable=True)),
@@ -35,7 +35,7 @@ def upgrade() -> None:
         ('bio', sa.Column('bio', sa.String(), nullable=True)),
         ('preferred_language', sa.Column('preferred_language', sa.String(), nullable=True)),
         ('timezone', sa.Column('timezone', sa.String(), nullable=True)),
-        ('updated_at', sa.Column('updated_at', sa.DateTime(timezone=True), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=True))
+        ('updated_at', sa.Column('updated_at', sa.DateTime(timezone=True), nullable=True))  # No server_default for SQLite
     ]
     
     # Add columns only if they don't exist
@@ -48,6 +48,9 @@ def upgrade() -> None:
         op.execute("UPDATE users SET preferred_language = 'en' WHERE preferred_language IS NULL")
     if column_exists('users', 'timezone'):
         op.execute("UPDATE users SET timezone = 'UTC' WHERE timezone IS NULL")
+    if column_exists('users', 'updated_at'):
+        # Set updated_at to current timestamp for existing users
+        op.execute("UPDATE users SET updated_at = datetime('now') WHERE updated_at IS NULL")
 
 
 def downgrade() -> None:

alembic/versions/003_sync_current_state.py

@@ -53,12 +53,16 @@ def upgrade() -> None:
             sa.Column('bio', sa.String(), nullable=True),
             sa.Column('preferred_language', sa.String(), nullable=True),
             sa.Column('timezone', sa.String(), nullable=True),
-            sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=True),
-            sa.Column('updated_at', sa.DateTime(timezone=True), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=True),
+            sa.Column('created_at', sa.DateTime(timezone=True), nullable=True),  # Remove server_default for SQLite
+            sa.Column('updated_at', sa.DateTime(timezone=True), nullable=True),  # Remove server_default for SQLite
             sa.PrimaryKeyConstraint('id')
         )
         op.create_index(op.f('ix_users_email'), 'users', ['email'], unique=True)
         op.create_index(op.f('ix_users_id'), 'users', ['id'], unique=False)
+        
+        # Set default timestamps for new table
+        op.execute("UPDATE users SET created_at = datetime('now') WHERE created_at IS NULL")
+        op.execute("UPDATE users SET updated_at = datetime('now') WHERE updated_at IS NULL")
     else:
         # Table exists, check for missing profile columns and add them
         profile_columns = [
@@ -68,7 +72,7 @@ def upgrade() -> None:
             ('bio', sa.Column('bio', sa.String(), nullable=True)),
             ('preferred_language', sa.Column('preferred_language', sa.String(), nullable=True)),
             ('timezone', sa.Column('timezone', sa.String(), nullable=True)),
-            ('updated_at', sa.Column('updated_at', sa.DateTime(timezone=True), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=True))
+            ('updated_at', sa.Column('updated_at', sa.DateTime(timezone=True), nullable=True))  # Remove server_default for SQLite
         ]
         
         for column_name, column_def in profile_columns:
@@ -80,6 +84,8 @@ def upgrade() -> None:
         op.execute("UPDATE users SET preferred_language = 'en' WHERE preferred_language IS NULL")
     if column_exists('users', 'timezone'):
         op.execute("UPDATE users SET timezone = 'UTC' WHERE timezone IS NULL")
+    if column_exists('users', 'updated_at'):
+        op.execute("UPDATE users SET updated_at = datetime('now') WHERE updated_at IS NULL")
 
 
 def downgrade() -> None:

app/models/user.py

@@ -1,5 +1,5 @@
 from sqlalchemy import Column, Integer, String, DateTime
-from sqlalchemy.sql import func
+from datetime import datetime
 from app.db.base import Base
 
 
@@ -15,5 +15,12 @@ class User(Base):
     bio = Column(String, nullable=True)
     preferred_language = Column(String, default="en")
     timezone = Column(String, default="UTC")
-    created_at = Column(DateTime(timezone=True), server_default=func.now())
-    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())
+    created_at = Column(DateTime(timezone=True), nullable=True)
+    updated_at = Column(DateTime(timezone=True), nullable=True)
+    
+    def __init__(self, **kwargs):
+        super().__init__(**kwargs)
+        if not self.created_at:
+            self.created_at = datetime.utcnow()
+        if not self.updated_at:
+            self.updated_at = datetime.utcnow()

app/routes/profile.py

@@ -3,6 +3,7 @@ from sqlalchemy.orm import Session
 from pydantic import BaseModel, EmailStr
 from typing import Optional
 import logging
+from datetime import datetime
 from app.db.session import get_db
 from app.models.user import User
 from app.utils.auth import get_current_user, get_password_hash, verify_password
@@ -90,6 +91,9 @@ async def update_profile(
         if profile_data.timezone is not None:
             current_user.timezone = profile_data.timezone
         
+        # Update the timestamp manually
+        current_user.updated_at = datetime.utcnow()
+        
         db.commit()
         db.refresh(current_user)
         
@@ -142,6 +146,7 @@ async def update_password(
         
         # Update password
         current_user.password_hash = get_password_hash(password_data.new_password)
+        current_user.updated_at = datetime.utcnow()
         db.commit()
         
         logger.info(f"Password updated successfully for user: {current_user.email}")
@@ -185,6 +190,7 @@ async def update_email(
         
         old_email = current_user.email
         current_user.email = email_data.new_email
+        current_user.updated_at = datetime.utcnow()
         db.commit()
         
         logger.info(f"Email updated successfully from {old_email} to {email_data.new_email}")