perf(db): сжать схему PostgreSQL 18 и повторно загрузить SQLite

При первом рестарте wipe всех таблиц и импорт из SQLite в компактную схему. Retention через DROP PARTITION, lz4 и AIO worker.

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

backend/src/db/partitions.ts

@@ -21,6 +21,37 @@ export const PARTITION_SPECS: PartitionSpec[] = [
   { parent: "internet_path_snapshots", kind: "week", keepDays: 21 },
 ]
 
+const WEEK_SLACK_DAYS = 7
+
+async function resolveKeepDays(pool: Pool): Promise<Map<string, number>> {
+  const map = new Map(PARTITION_SPECS.map((s) => [s.parent, s.keepDays]))
+  try {
+    const traffic = await pool.query<{ retention_days: number }>(
+      `SELECT retention_days FROM traffic_settings WHERE id = 1`,
+    )
+    const td = Number(traffic.rows[0]?.retention_days)
+    if (Number.isFinite(td) && td > 0) map.set("traffic_samples", td + WEEK_SLACK_DAYS)
+
+    const uptime = await pool.query<{ retention_days: number }>(
+      `SELECT retention_days FROM uptime_settings WHERE id = 1`,
+    )
+    const ud = Number(uptime.rows[0]?.retention_days)
+    if (Number.isFinite(ud) && ud > 0) {
+      map.set("uptime_probe_samples", ud + WEEK_SLACK_DAYS)
+      map.set("uptime_resource_samples", ud + WEEK_SLACK_DAYS)
+    }
+
+    const path = await pool.query<{ retention_days: number }>(
+      `SELECT retention_days FROM internet_path_settings WHERE id = 1`,
+    )
+    const pd = Number(path.rows[0]?.retention_days)
+    if (Number.isFinite(pd) && pd > 0) map.set("internet_path_snapshots", pd + WEEK_SLACK_DAYS)
+  } catch {
+    /* settings may be absent mid-migration */
+  }
+  return map
+}
+
 function utcDate(d: Date): Date {
   return new Date(Date.UTC(d.getUTCFullYear(), d.getUTCMonth(), d.getUTCDate()))
 }
@@ -82,10 +113,29 @@ export async function ensurePartitionFor(
   return name
 }
 
+export async function ensurePartitionsBetween(
+  pool: Pool,
+  parent: string,
+  kind: PartitionKind,
+  from: Date,
+  to: Date,
+): Promise<void> {
+  const start = from.getTime() <= to.getTime() ? from : to
+  const end = from.getTime() <= to.getTime() ? to : from
+  for (let t = new Date(start.getTime()); t <= end; ) {
+    await ensurePartitionFor(pool, parent, kind, t)
+    if (kind === "day") t = addUtcDays(t, 1)
+    else if (kind === "week") t = addUtcDays(t, 7)
+    else t = new Date(Date.UTC(t.getUTCFullYear(), t.getUTCMonth() + 1, 1))
+  }
+}
+
 export async function ensurePartitionsAround(pool: Pool, around = new Date()): Promise<void> {
+  const keepDays = await resolveKeepDays(pool)
   for (const spec of PARTITION_SPECS) {
+    const keep = keepDays.get(spec.parent) ?? spec.keepDays
     const daysAhead = spec.kind === "month" ? 40 : spec.kind === "week" ? 21 : 8
-    const start = addUtcDays(around, -spec.keepDays)
+    const start = addUtcDays(around, -keep)
     const end = addUtcDays(around, daysAhead)
     for (let t = new Date(start.getTime()); t < end; ) {
       await ensurePartitionFor(pool, spec.parent, spec.kind, t)
@@ -97,8 +147,10 @@ export async function ensurePartitionsAround(pool: Pool, around = new Date()): P
 }
 
 export async function dropExpiredPartitions(pool: Pool, around = new Date()): Promise<void> {
+  const keepDays = await resolveKeepDays(pool)
   for (const spec of PARTITION_SPECS) {
-    const cutoff = addUtcDays(around, -spec.keepDays)
+    const keep = keepDays.get(spec.parent) ?? spec.keepDays
+    const cutoff = addUtcDays(around, -keep)
     const { rows } = await pool.query<{ relname: string }>(
       `SELECT c.relname
        FROM pg_inherits i