feat(retention): export/clean/rehydrate endpoints for task content

agentex/database/migrations/alembic/versions/2026_05_19_1929_adding_task_cleaned_at_6c942325c828.py

@@ -0,0 +1,26 @@
+"""adding task cleaned at
+
+Revision ID: 6c942325c828
+Revises: a9959ebcbe98
+Create Date: 2026-05-19 19:29:34.858692
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = '6c942325c828'
+down_revision: Union[str, None] = 'a9959ebcbe98'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.add_column('tasks', sa.Column('cleaned_at', sa.DateTime(timezone=True), nullable=True))
+
+
+def downgrade() -> None:
+    op.drop_column('tasks', 'cleaned_at')

agentex/database/migrations/migration_history.txt

@@ -1,4 +1,6 @@
-9ff3ee32c81b -> e9c4ff9e6542 (head), add_tasks_metadata_gin_index
+a9959ebcbe98 -> 6c942325c828 (head), adding task cleaned at
+e9c4ff9e6542 -> a9959ebcbe98, finalize_spans_task_id
+9ff3ee32c81b -> e9c4ff9e6542, add_tasks_metadata_gin_index
 57c5ed4f59ae -> 9ff3ee32c81b, uppercase deployment status enum labels
 4a9b7787ccd7 -> 57c5ed4f59ae, add_task_id_to_spans
 d1a6cde41b3f -> 4a9b7787ccd7, deployments