Swap executor config for executor

backend/migrations/009_change_executor_config_to_executor.sql

@@ -0,0 +1,18 @@
+-- Change executor_config column to executor (string) in task_attempts table
+
+-- Add the new executor column
+ALTER TABLE task_attempts ADD COLUMN executor TEXT;
+
+-- Convert existing executor_config data to executor names
+-- This assumes the existing JSONB data has a structure we can extract from
+UPDATE task_attempts 
+SET executor = CASE 
+    WHEN executor_config IS NULL THEN NULL
+    WHEN executor_config->>'type' = 'Echo' THEN 'echo'
+    WHEN executor_config->>'type' = 'Claude' THEN 'claude'
+    ELSE 'echo' -- Default fallback
+END
+WHERE executor_config IS NOT NULL;
+
+-- Drop the old executor_config column
+ALTER TABLE task_attempts DROP COLUMN executor_config;