Fix PostgreSQL schema init: commit DDL before ALTER migrations.

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

app.py

@@ -325,6 +325,7 @@ def init_db():
                   trigger_price REAL, stop_loss REAL, take_profit REAL,
                   result TEXT,
                   created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP)''')
+    conn.commit()
     migrations = [
         "ALTER TABLE key_monitors ADD COLUMN symbol_name TEXT",
         "ALTER TABLE key_monitors ADD COLUMN upper_triggered INTEGER DEFAULT 0",
@@ -376,6 +377,7 @@ def init_db():
             if not is_schema_migration_error(exc):
                 raise
             rollback_if_postgres(conn)
+    conn.commit()
     c.execute('''CREATE TABLE IF NOT EXISTS review_records
                  (id INTEGER PRIMARY KEY AUTOINCREMENT,
                   open_time TEXT, close_time TEXT,
@@ -422,6 +424,7 @@ def init_db():
                  (key TEXT PRIMARY KEY,
                   data_json TEXT NOT NULL,
                   updated_at TEXT NOT NULL)''')
+    conn.commit()
     for sql in (
         "ALTER TABLE fee_rates ADD COLUMN source TEXT DEFAULT 'local'",
     ):