fix: use Python asyncpg migration runner instead of psql, remove postgresql-client from image

services/shared/migrate.py

@@ -0,0 +1,77 @@
+"""Database migration runner using asyncpg.
+
+Applies all SQL migration files from infra/migrations/ in sorted order.
+Each file is split on semicolons and executed statement-by-statement.
+Idempotent — migrations use IF NOT EXISTS / CREATE OR REPLACE patterns.
+
+Usage:
+    python -m services.shared.migrate
+"""
+import asyncio
+import glob
+import logging
+import os
+import sys
+
+import asyncpg
+
+logger = logging.getLogger("migrate")
+
+
+async def run_migrations() -> None:
+    host = os.getenv("POSTGRES_HOST", "localhost")
+    port = int(os.getenv("POSTGRES_PORT", "5432"))
+    user = os.getenv("POSTGRES_USER", "stonks")
+    password = os.getenv("POSTGRES_PASSWORD", "")
+    database = os.getenv("POSTGRES_DB", "stonks")
+
+    migrations_dir = os.path.join(
+        os.path.dirname(__file__), "..", "..", "infra", "migrations"
+    )
+    migrations_dir = os.path.normpath(migrations_dir)
+
+    if not os.path.isdir(migrations_dir):
+        logger.error("Migrations directory not found: %s", migrations_dir)
+        sys.exit(1)
+
+    files = sorted(glob.glob(os.path.join(migrations_dir, "*.sql")))
+    if not files:
+        logger.warning("No migration files found in %s", migrations_dir)
+        return
+
+    logger.info("Connecting to %s@%s:%d/%s", user, host, port, database)
+    conn = await asyncpg.connect(
+        host=host, port=port, user=user, password=password, database=database
+    )
+
+    try:
+        for path in files:
+            name = os.path.basename(path)
+            with open(path) as f:
+                sql = f.read()
+            # Split on semicolons and execute each statement individually.
+            # asyncpg.execute() doesn't support multi-statement strings.
+            statements = [s.strip() for s in sql.split(";") if s.strip()]
+            try:
+                for stmt in statements:
+                    await conn.execute(stmt)
+                logger.info("  ✓ %s (%d statements)", name, len(statements))
+            except Exception as exc:
+                logger.warning("  ⚠ %s: %s", name, exc)
+    finally:
+        await conn.close()
+
+    logger.info("Migrations complete (%d files)", len(files))
+
+
+def main() -> None:
+    logging.basicConfig(
+        level=logging.INFO,
+        format="%(asctime)s %(name)s %(message)s",
+        datefmt="%H:%M:%S",
+    )
+    asyncio.run(run_migrations())
+
+
+if __name__ == "__main__":
+    main()