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Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/alembic/versions/014_timescaledb_retention.py

@@ -0,0 +1,50 @@
+"""Add TimescaleDB retention policies.
+
+Revision ID: 014
+Revises: 013
+Create Date: 2026-03-03
+
+Adds retention (drop after 90 days) on all three hypertables:
+interface_metrics, health_metrics, wireless_metrics.
+
+Note: Compression is skipped because TimescaleDB 2.17.x does not support
+compression on tables with row-level security (RLS) policies.
+Compression can be re-added when upgrading to TimescaleDB >= 2.19.
+
+Without retention policies the database grows ~5 GB/month unbounded.
+"""
+
+revision = "014"
+down_revision = "013"
+branch_labels = None
+depends_on = None
+
+from alembic import op
+import sqlalchemy as sa
+
+
+HYPERTABLES = [
+    "interface_metrics",
+    "health_metrics",
+    "wireless_metrics",
+]
+
+
+def upgrade() -> None:
+    conn = op.get_bind()
+
+    for table in HYPERTABLES:
+        # Drop chunks older than 90 days
+        conn.execute(sa.text(
+            f"SELECT add_retention_policy('{table}', INTERVAL '90 days')"
+        ))
+
+
+def downgrade() -> None:
+    conn = op.get_bind()
+
+    for table in HYPERTABLES:
+        # Remove retention policy
+        conn.execute(sa.text(
+            f"SELECT remove_retention_policy('{table}', if_exists => true)"
+        ))