Investigate comments loading issue (Issue #4)

- Added debug logging to post_detail route to track comment loading
- Created migration script for poll source fields (max_posts, fetch_comments, priority)
- Migration adds default values to ensure comments are fetched

The issue may be that existing poll sources in database dont have fetch_comments field.
Migration needs to be run on server with database access.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

migrate_poll_source_fields.py

@@ -0,0 +1,66 @@
+#!/usr/bin/env python3
+"""
+Database migration to add new polling configuration fields to poll_sources table.
+Run this once to add the new columns: max_posts, fetch_comments, priority
+"""
+
+import sys
+from app import app, db
+
+def migrate():
+    """Add polling configuration columns to poll_sources table"""
+    with app.app_context():
+        try:
+            # Check if columns already exist
+            from sqlalchemy import inspect
+            inspector = inspect(db.engine)
+            columns = [col['name'] for col in inspector.get_columns('poll_sources')]
+
+            if 'max_posts' in columns and 'fetch_comments' in columns and 'priority' in columns:
+                print("✓ Polling configuration columns already exist")
+                return True
+
+            # Add the new columns using raw SQL
+            with db.engine.connect() as conn:
+                if 'max_posts' not in columns:
+                    print("Adding max_posts column...")
+                    conn.execute(db.text(
+                        "ALTER TABLE poll_sources ADD COLUMN max_posts INTEGER NOT NULL DEFAULT 100"
+                    ))
+                    conn.commit()
+
+                if 'fetch_comments' not in columns:
+                    print("Adding fetch_comments column...")
+                    conn.execute(db.text(
+                        "ALTER TABLE poll_sources ADD COLUMN fetch_comments BOOLEAN NOT NULL DEFAULT TRUE"
+                    ))
+                    conn.commit()
+
+                if 'priority' not in columns:
+                    print("Adding priority column...")
+                    conn.execute(db.text(
+                        "ALTER TABLE poll_sources ADD COLUMN priority VARCHAR(20) NOT NULL DEFAULT 'medium'"
+                    ))
+                    conn.commit()
+
+            print("✓ Polling configuration columns added successfully")
+            print("\nUpdating existing poll sources with default values...")
+
+            # Update existing rows to have default values
+            with db.engine.connect() as conn:
+                result = conn.execute(db.text("UPDATE poll_sources SET fetch_comments = TRUE WHERE fetch_comments IS NULL"))
+                conn.commit()
+                print(f"✓ Updated {result.rowcount} rows with default fetch_comments=TRUE")
+
+            return True
+
+        except Exception as e:
+            print(f"✗ Migration failed: {e}")
+            import traceback
+            traceback.print_exc()
+            return False
+
+if __name__ == '__main__':
+    print("Running poll source fields migration...")
+    success = migrate()
+    sys.exit(0 if success else 1)