Fix PostgreSQL DDL: use single-quoted DEFAULT literals.

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

app.py

@@ -309,7 +309,7 @@ def init_db():
                   symbol TEXT, symbol_name TEXT, direction TEXT,
                   zone_upper REAL, zone_lower REAL,
                   stop_loss REAL, take_profit REAL,
-                  status TEXT DEFAULT "planned",
+                  status TEXT DEFAULT 'planned',
                   triggered_at TIMESTAMP,
                   created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP)''')
     c.execute('''CREATE TABLE IF NOT EXISTS key_monitors

db_conn.py

@@ -84,6 +84,7 @@ def adapt_sql(sql: str) -> str:
         flags=re.IGNORECASE,
     )
     out = re.sub(r"\bAUTOINCREMENT\b", "", out, flags=re.IGNORECASE)
+    out = re.sub(r'DEFAULT\s+"([^"]*)"', r"DEFAULT '\1'", out, flags=re.IGNORECASE)
     if "?" in out:
         out = out.replace("?", "%s")
     return out