fix: SQLite column migration + startup init_schema + missing DB_URL warning

- db.py: auto-migrate missing columns (signal_correct, pnl_dkk, etc.) on existing SQLite DBs
- db.py: print warning to stderr if DATABASE_URL not set
- dashboard.py: call init_schema() at startup so columns always exist

db.py

@@ -27,6 +27,14 @@ DATABASE_URL = os.getenv("DATABASE_URL", "")
 SQLITE_PATH  = Path(__file__).parent / "ground_news.db"
 DB_TYPE      = "postgres" if DATABASE_URL else "sqlite"
 
+if not DATABASE_URL:
+    import sys
+    print(
+        "⚠️  WARNING: DATABASE_URL not set — using SQLite fallback at "
+        f"{SQLITE_PATH}",
+        file=sys.stderr,
+    )
+
 
 # ── DBConn wrapper ────────────────────────────────────────────────────────────
 
@@ -387,11 +395,34 @@ def init_schema():
     else:
         conn = sqlite3.connect(str(SQLITE_PATH))
         conn.executescript(SCHEMA_SQLITE)
+        _migrate_sqlite_columns(conn)
         conn.commit()
         conn.close()
     print(f"  Schema initialiseret ({DB_TYPE})")
 
 
+def _migrate_sqlite_columns(conn):
+    """Add any missing columns to existing SQLite tables (forward migrations)."""
+    migrations = {
+        "position_events": [
+            ("signal_correct", "INTEGER"),
+            ("pnl_dkk",        "REAL"),
+        ],
+        "positions": [
+            ("stop_loss",   "REAL"),
+            ("take_profit", "REAL"),
+            ("analyst_rec", "TEXT"),
+            ("note",        "TEXT"),
+        ],
+    }
+    for table, cols in migrations.items():
+        existing = {row[1] for row in conn.execute(f"PRAGMA table_info({table})")}
+        for col, col_type in cols:
+            if col not in existing:
+                conn.execute(f"ALTER TABLE {table} ADD COLUMN {col} {col_type}")
+                print(f"  SQLite migration: {table}.{col} ({col_type}) added")
+
+
 # ── SQLite → Postgres migration ───────────────────────────────────────────────
 
 def migrate_sqlite_to_postgres():