diff --git a/backend/migrations/20250720000000_add_cleanupscript_to_process_type_constraint.sql b/backend/migrations/20250720000000_add_cleanupscript_to_process_type_constraint.sql
index 0c332cbd..fc875be4 100644
--- a/backend/migrations/20250720000000_add_cleanupscript_to_process_type_constraint.sql
+++ b/backend/migrations/20250720000000_add_cleanupscript_to_process_type_constraint.sql
@@ -1,40 +1,25 @@
--- Update CHECK constraint to include cleanupscript
-PRAGMA foreign_keys = OFF;
+-- 1. Add the replacement column with the wider CHECK
+ALTER TABLE execution_processes
+  ADD COLUMN process_type_new TEXT NOT NULL DEFAULT 'setupscript'
+    CHECK (process_type_new IN ('setupscript',
+                                'cleanupscript',   -- new value 🎉
+                                'codingagent',
+                                'devserver'));
 
--- Create new table with updated constraint
-CREATE TABLE execution_processes_new (
-    id                BLOB PRIMARY KEY,
-    task_attempt_id   BLOB NOT NULL,
-    process_type      TEXT NOT NULL DEFAULT 'setupscript'
-                         CHECK (process_type IN ('setupscript','cleanupscript','codingagent','devserver')),
-    status            TEXT NOT NULL DEFAULT 'running'
-                         CHECK (status IN ('running','completed','failed','killed')),
-    command           TEXT NOT NULL,
-    args              TEXT,  -- JSON array of arguments
-    working_directory TEXT NOT NULL,
-    stdout            TEXT,
-    stderr            TEXT,
-    exit_code         INTEGER,
-    started_at        TEXT NOT NULL DEFAULT (datetime('now', 'subsec')),
-    completed_at      TEXT,
-    created_at        TEXT NOT NULL DEFAULT (datetime('now', 'subsec')),
-    updated_at        TEXT NOT NULL DEFAULT (datetime('now', 'subsec')),
-    executor_type     TEXT,
-    FOREIGN KEY (task_attempt_id) REFERENCES task_attempts(id) ON DELETE CASCADE
-);
+-- 2. Copy existing values across
+UPDATE execution_processes
+  SET process_type_new = process_type;
 
--- Copy data from old table
-INSERT INTO execution_processes_new SELECT * FROM execution_processes;
+-- 3. Drop any indexes that mention the old column
+DROP INDEX IF EXISTS idx_execution_processes_type;
 
--- Drop old table
-DROP TABLE execution_processes;
+-- 4. Remove the old column (requires 3.35+)
+ALTER TABLE execution_processes DROP COLUMN process_type;
 
--- Rename new table
-ALTER TABLE execution_processes_new RENAME TO execution_processes;
+-- 5. Rename the new column back to the canonical name
+ALTER TABLE execution_processes
+  RENAME COLUMN process_type_new TO process_type;
 
--- Recreate indexes
-CREATE INDEX idx_execution_processes_task_attempt_id ON execution_processes(task_attempt_id);
-CREATE INDEX idx_execution_processes_status ON execution_processes(status);
-CREATE INDEX idx_execution_processes_type ON execution_processes(process_type);
-
-PRAGMA foreign_keys = ON;
+-- 6. Re-create the index
+CREATE INDEX idx_execution_processes_type
+        ON execution_processes(process_type);
\ No newline at end of file