Add Amnezia Web Panel source with PostgreSQL 17 storage.

Co-authored-by: Cursor <cursoragent@cursor.com>

db/connection.py

@@ -0,0 +1,82 @@
+"""PostgreSQL connection pool for Amnezia Web Panel."""
+
+from __future__ import annotations
+
+import logging
+import os
+import threading
+from pathlib import Path
+
+from dotenv import load_dotenv
+
+load_dotenv()
+
+logger = logging.getLogger(__name__)
+
+DEFAULT_DATABASE_URL = 'postgresql://amnezia:amnezia@localhost:5432/amnezia_panel'
+
+_pool = None
+_pool_lock = threading.Lock()
+_schema_ready = False
+
+
+def get_database_url() -> str:
+    return os.environ.get('DATABASE_URL', DEFAULT_DATABASE_URL).strip()
+
+
+def get_pool():
+    global _pool
+    if _pool is not None:
+        return _pool
+    with _pool_lock:
+        if _pool is not None:
+            return _pool
+        from psycopg.rows import dict_row
+        from psycopg_pool import ConnectionPool
+
+        url = get_database_url()
+        logger.info('Connecting to PostgreSQL…')
+        _pool = ConnectionPool(
+            conninfo=url,
+            min_size=1,
+            max_size=10,
+            kwargs={
+                'autocommit': False,
+                'row_factory': dict_row,
+            },
+            open=True,
+        )
+        return _pool
+
+
+def close_pool():
+    global _pool, _schema_ready
+    with _pool_lock:
+        if _pool is not None:
+            _pool.close()
+            _pool = None
+        _schema_ready = False
+
+
+def init_schema():
+    """Create tables if they do not exist."""
+    global _schema_ready
+    if _schema_ready:
+        return
+    schema_path = Path(__file__).with_name('schema.sql')
+    sql = schema_path.read_text(encoding='utf-8')
+    pool = get_pool()
+    with pool.connection() as conn:
+        with conn.cursor() as cur:
+            # psycopg3 executes one statement per execute()
+            for raw in sql.split(';'):
+                lines = [
+                    ln for ln in raw.splitlines()
+                    if ln.strip() and not ln.strip().startswith('--')
+                ]
+                stmt = '\n'.join(lines).strip()
+                if stmt:
+                    cur.execute(stmt)
+        conn.commit()
+    _schema_ready = True
+    logger.info('PostgreSQL schema ready')