fix: resolve database initialization failures

- Add alembic>=1.12.0 to main dependencies (was only in dev deps)
- Update PostgreSQL connector to use psycopg (v3) driver instead of psycopg2
- Fix SQLAlchemy 2.0 compatibility by using text() instead of Text() for queries

✅ Quality: Database initialization now works with uv
✅ Tests: Connection and schema creation verified
📋 TaskMaster: Database infrastructure fixes complete

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

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

Author: MementoRC

pyproject.toml

@@ -39,6 +39,7 @@ dependencies = [
     "psutil>=5.9.0",
     "SQLAlchemy>=2.0.0", # Added for PostgreSQL ORM
     "psycopg[binary]>=3.1.0", # Added for PostgreSQL driver
+    "alembic>=1.12.0", # Added for database migrations
 ]
 
 [project.optional-dependencies]

src/uckn/storage/postgresql_connector.py

@@ -2,7 +2,7 @@
 from typing import Any, Dict, List, Optional
 from datetime import datetime
 
-from sqlalchemy import create_engine, Column, String, Text, DateTime, Float, ForeignKey
+from sqlalchemy import create_engine, Column, String, Text, DateTime, Float, ForeignKey, text
 from sqlalchemy.orm import sessionmaker, declarative_base, relationship
 from sqlalchemy.exc import SQLAlchemyError
 from sqlalchemy.pool import QueuePool
@@ -122,8 +122,13 @@ def __init__(self, db_url: str = "postgresql://user:password@localhost:5432/uckn
     def _connect_to_db(self) -> None:
         """Initializes the SQLAlchemy engine and session factory."""
         try:
+            # Ensure we use psycopg (version 3) driver instead of psycopg2
+            db_url = self.db_url
+            if db_url.startswith("postgresql://"):
+                db_url = db_url.replace("postgresql://", "postgresql+psycopg://", 1)
+            
             self.engine = create_engine(
-                self.db_url,
+                db_url,
                 poolclass=QueuePool,
                 pool_size=self.pool_size,
                 max_overflow=self.max_overflow,
@@ -159,7 +164,7 @@ def is_available(self) -> bool:
             return False
         try:
             with self.get_db_session() as session:
-                session.execute(Text("SELECT 1"))
+                session.execute(text("SELECT 1"))
             return True
         except SQLAlchemyError as e:
             self._logger.error(f"PostgreSQL connection check failed: {e}")