fc3d: migration 0014 — source.consecutive_failures + import_settings scheduling knobs

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

alembic/versions/0014_fc3d_scheduling.py

@@ -0,0 +1,58 @@
+"""fc3d: scheduling + source health columns
+
+Revision ID: 0014
+Revises: 0013
+Create Date: 2026-05-21
+
+Additive only. source.consecutive_failures (default 0, DownloadService
+finalize hook owns the writes). import_settings gains the three
+scheduling knobs (global default interval, event retention, failure
+warning threshold).
+"""
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+
+revision: str = "0014"
+down_revision: Union[str, None] = "0013"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.add_column(
+        "source",
+        sa.Column(
+            "consecutive_failures", sa.Integer(),
+            nullable=False, server_default="0",
+        ),
+    )
+    op.add_column(
+        "import_settings",
+        sa.Column(
+            "download_schedule_default_seconds", sa.Integer(),
+            nullable=False, server_default="28800",
+        ),
+    )
+    op.add_column(
+        "import_settings",
+        sa.Column(
+            "download_event_retention_days", sa.Integer(),
+            nullable=False, server_default="90",
+        ),
+    )
+    op.add_column(
+        "import_settings",
+        sa.Column(
+            "download_failure_warning_threshold", sa.Integer(),
+            nullable=False, server_default="5",
+        ),
+    )
+
+
+def downgrade() -> None:
+    op.drop_column("import_settings", "download_failure_warning_threshold")
+    op.drop_column("import_settings", "download_event_retention_days")
+    op.drop_column("import_settings", "download_schedule_default_seconds")
+    op.drop_column("source", "consecutive_failures")