rebuild(screener): add controlled formulas and rolling backtests

next/backend/database/migrations/m0012_screener_backtests.py

@@ -0,0 +1,31 @@
+from __future__ import annotations
+
+import sqlite3
+
+from backend.database.migrations.runner import Migration
+
+
+def upgrade(connection: sqlite3.Connection) -> None:
+    connection.execute(
+        """
+        CREATE TABLE screener_run_backtests (
+            run_id INTEGER PRIMARY KEY
+                REFERENCES screener_runs(id) ON DELETE CASCADE,
+            payload_json TEXT NOT NULL,
+            created_at TEXT NOT NULL
+        )
+        """
+    )
+
+
+def downgrade(connection: sqlite3.Connection) -> None:
+    connection.execute("DROP TABLE screener_run_backtests")
+
+
+MIGRATION = Migration(
+    version=12,
+    name="create_screener_backtests",
+    signature="screener:v2:persistent-rolling-backtests",
+    upgrade=upgrade,
+    downgrade=downgrade,
+)