feat(task-012): orchestrate parallel section production jobs

apps/backend/src/infrastructure/schema.py

@@ -260,6 +260,7 @@ POSTGRES_SCHEMA_STATEMENTS: tuple[str, ...] = (
         workspace_path TEXT,
         input_files JSONB NOT NULL DEFAULT '[]'::jsonb,
         output_files JSONB NOT NULL DEFAULT '[]'::jsonb,
+        payload JSONB NOT NULL DEFAULT '{{}}'::jsonb,
         error_category TEXT CHECK (
             error_category IS NULL
             OR error_category IN ({AGENT_JOB_ERROR_CATEGORY_VALUES})
@@ -280,6 +281,7 @@ POSTGRES_SCHEMA_STATEMENTS: tuple[str, ...] = (
     "ALTER TABLE agent_jobs ADD COLUMN IF NOT EXISTS stderr TEXT NOT NULL DEFAULT ''",
     "ALTER TABLE agent_jobs ADD COLUMN IF NOT EXISTS exit_code INTEGER",
     "ALTER TABLE agent_jobs ADD COLUMN IF NOT EXISTS duration_ms INTEGER",
+    "ALTER TABLE agent_jobs ADD COLUMN IF NOT EXISTS payload JSONB NOT NULL DEFAULT '{}'::jsonb",
     """
     CREATE TABLE IF NOT EXISTS research_run_manifests (
         id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
@@ -568,6 +570,7 @@ SQLITE_SCHEMA_STATEMENTS: tuple[str, ...] = (
         workspace_path TEXT,
         input_files TEXT NOT NULL DEFAULT '[]',
         output_files TEXT NOT NULL DEFAULT '[]',
+        payload TEXT NOT NULL DEFAULT '{}',
         error_category TEXT,
         error_message TEXT,
         stdout TEXT NOT NULL DEFAULT '',