feat(statistics): добавить раздел статистики трафика

Куб IPFIX час+день с AND-слайсами и экраном отчётности /statistics, живой /traffic не меняем.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/drizzle/0005_flow_facts.sql

@@ -0,0 +1,39 @@
+-- Statistics cube: hour + daily facts (server × iface × country × service × ASN).
+-- Compact types, fillfactor for HOT upserts, autovacuum tuned for ON CONFLICT.
+-- Retention: DROP partitions only (see PARTITION_SPECS).
+
+CREATE TABLE IF NOT EXISTS flow_hour_facts (
+  server_id BIGINT NOT NULL REFERENCES servers(id) ON DELETE CASCADE,
+  bucket_at TIMESTAMPTZ NOT NULL,
+  iface TEXT NOT NULL,
+  country CHAR(2) NOT NULL,
+  service TEXT NOT NULL,
+  asn INTEGER NOT NULL,
+  bytes BIGINT NOT NULL DEFAULT 0,
+  packets BIGINT NOT NULL DEFAULT 0,
+  PRIMARY KEY (server_id, bucket_at, iface, country, service, asn)
+) PARTITION BY RANGE (bucket_at);
+
+ALTER TABLE flow_hour_facts SET (
+  fillfactor = 70,
+  autovacuum_vacuum_scale_factor = 0.05,
+  autovacuum_vacuum_cost_limit = 2000
+);
+
+CREATE TABLE IF NOT EXISTS flow_daily_facts (
+  server_id BIGINT NOT NULL REFERENCES servers(id) ON DELETE CASCADE,
+  day DATE NOT NULL,
+  iface TEXT NOT NULL,
+  country CHAR(2) NOT NULL,
+  service TEXT NOT NULL,
+  asn INTEGER NOT NULL,
+  bytes BIGINT NOT NULL DEFAULT 0,
+  packets BIGINT NOT NULL DEFAULT 0,
+  PRIMARY KEY (server_id, day, iface, country, service, asn)
+) PARTITION BY RANGE (day);
+
+ALTER TABLE flow_daily_facts SET (
+  fillfactor = 70,
+  autovacuum_vacuum_scale_factor = 0.05,
+  autovacuum_vacuum_cost_limit = 2000
+);