fix(statistics): убрать параметры хранения с родительских партиций

PostgreSQL 42809: FILLFACTOR и autovacuum нельзя задавать на partitioned parent — только на листьях.

Co-authored-by: Cursor <[email protected]>

backend/src/db/partitions.ts

@@ -8,6 +8,12 @@ export interface PartitionSpec {
   keepDays: number
 }
 
+/** Leaf-only: PG forbids storage params on partitioned parents (SQLSTATE 42809). */
+const FACT_LEAF_STORAGE =
+  "fillfactor = 70, autovacuum_vacuum_scale_factor = 0.05, autovacuum_vacuum_cost_limit = 2000"
+
+const FACT_PARENTS = new Set(["flow_hour_facts", "flow_daily_facts"])
+
 export const PARTITION_SPECS: PartitionSpec[] = [
   { parent: "flow_buckets", kind: "day", keepDays: 4 },
   { parent: "flow_minute_stats", kind: "day", keepDays: 4 },
@@ -112,6 +118,9 @@ export async function ensurePartitionFor(
   await pool.query(
     `CREATE TABLE IF NOT EXISTS ${name} PARTITION OF ${parent} FOR VALUES FROM ('${from}') TO ('${to}')`,
   )
+  if (FACT_PARENTS.has(parent)) {
+    await pool.query(`ALTER TABLE ${name} SET (${FACT_LEAF_STORAGE})`)
+  }
   return name
 }