task: add edge observability tables (#9307)

Adds two stat tables to store edge observability data.

src/migrations/20250210130408-add-edge-observability-tables.js

@@ -0,0 +1,32 @@
+exports.up = (db, cb) => {
+  db.runSql(`
+    CREATE TABLE stat_edge_observability (
+        instance_id TEXT NOT NULL PRIMARY KEY,
+        reported_at TIMESTAMP WITH TIME ZONE NOT NULL,
+        app_name TEXT,
+        started TIMESTAMP WITH TIME ZONE NOT NULL,
+        edge_version TEXT NOT NULL,
+        region TEXT,
+        cpu_usage NUMERIC DEFAULT 0.0,
+        memory_usage INTEGER DEFAULT 0,
+        connected_streaming_clients INTEGER NOT NULL DEFAULT 0,
+        connected_via TEXT,
+        client_features_average_latency_ms NUMERIC DEFAULT 0.0,
+        client_features_p99_latency_ms NUMERIC DEFAULT 0.0,
+        frontend_api_average_latency_ms NUMERIC DEFAULT 0.0,
+        frontend_api_p99_latency_ms NUMERIC DEFAULT 0.0,
+        upstream_features_average_latency_ms NUMERIC DEFAULT 0.0,
+        upstream_features_p99_latency_ms NUMERIC DEFAULT 0.0,
+        upstream_metrics_average_latency_ms NUMERIC DEFAULT 0.0,
+        upstream_metrics_p99_latency_ms NUMERIC DEFAULT 0.0,
+        upstream_edge_average_latency_ms NUMERIC DEFAULT 0.0,
+        upstream_edge_p99_latency_ms NUMERIC DEFAULT 0.0
+    );
+    CREATE INDEX edge_observability_connected_via_idx ON stat_edge_observability(connected_via) WHERE connected_via IS NOT NULL;
+    CREATE INDEX edge_observability_app_name_idx ON stat_edge_observability(app_name) WHERE app_name IS NOT NULL;
+  `, cb);
+};
+
+exports.down = (db, cb) => {
+  db.runSql(`DROP TABLE IF EXISTS stat_edge_observability;`, cb);
+};

src/migrations/20250212130610-add-stat-edge-traffic-table.js

@@ -0,0 +1,16 @@
+exports.up = (db, cb) => {
+  db.runSql(`CREATE TABLE stat_edge_traffic_usage(
+    instance_id TEXT NOT NULL,
+    day DATE NOT NULL,
+    traffic_group TEXT NOT NULL,
+    count BIGINT NOT NULL DEFAULT 0,
+    PRIMARY KEY (instance_id, day, traffic_group)
+  );
+    CREATE INDEX stat_edge_traffic_usage_traffic_group_idx ON stat_edge_traffic_usage(traffic_group);
+    CREATE INDEX stat_edge_traffic_usage_day_idx ON stat_edge_traffic_usage(day);
+`, cb);
+};
+
+exports.down = (db, cb) => {
+  db.runSql(`DROP TABLE stat_edge_traffic_usage;`, cb);
+};