feat: Implement load balancing and health check features for service groups, including DNS-based load balancing modes and health check configurations, enhancing service reliability and performance monitoring

packages/db/migrations/012_lb_health_check.sql

@@ -0,0 +1,39 @@
+ALTER TABLE services ADD COLUMN lb_weight INTEGER NOT NULL DEFAULT 1;
+ALTER TABLE services ADD COLUMN lb_priority INTEGER NOT NULL DEFAULT 1;
+
+ALTER TABLE service_groups ADD COLUMN lb_mode TEXT NOT NULL DEFAULT 'round_robin';
+ALTER TABLE service_groups ADD COLUMN health_check_enabled INTEGER NOT NULL DEFAULT 0;
+ALTER TABLE service_groups ADD COLUMN health_check_type TEXT NOT NULL DEFAULT 'tcp';
+ALTER TABLE service_groups ADD COLUMN health_check_port INTEGER;
+ALTER TABLE service_groups ADD COLUMN health_check_path TEXT;
+ALTER TABLE service_groups ADD COLUMN health_check_expected_status INTEGER;
+ALTER TABLE service_groups ADD COLUMN health_check_interval_sec INTEGER NOT NULL DEFAULT 30;
+ALTER TABLE service_groups ADD COLUMN health_check_timeout_ms INTEGER NOT NULL DEFAULT 3000;
+
+ALTER TABLE service_bindings ADD COLUMN lb_mode TEXT NOT NULL DEFAULT 'round_robin';
+ALTER TABLE service_bindings ADD COLUMN health_check_enabled INTEGER NOT NULL DEFAULT 0;
+ALTER TABLE service_bindings ADD COLUMN health_check_type TEXT NOT NULL DEFAULT 'tcp';
+ALTER TABLE service_bindings ADD COLUMN health_check_port INTEGER;
+ALTER TABLE service_bindings ADD COLUMN health_check_path TEXT;
+ALTER TABLE service_bindings ADD COLUMN health_check_expected_status INTEGER;
+ALTER TABLE service_bindings ADD COLUMN health_check_interval_sec INTEGER NOT NULL DEFAULT 30;
+ALTER TABLE service_bindings ADD COLUMN health_check_timeout_ms INTEGER NOT NULL DEFAULT 3000;
+
+ALTER TABLE service_binding_ips ADD COLUMN weight INTEGER NOT NULL DEFAULT 1;
+ALTER TABLE service_binding_ips ADD COLUMN priority INTEGER NOT NULL DEFAULT 1;
+
+CREATE TABLE ip_health_status (
+    scope TEXT NOT NULL,
+    ref_id INTEGER NOT NULL,
+    ip TEXT NOT NULL,
+    status TEXT NOT NULL DEFAULT 'unknown',
+    latency_ms INTEGER,
+    consecutive_failures INTEGER NOT NULL DEFAULT 0,
+    last_checked_at TEXT,
+    last_error TEXT,
+    created_at TEXT NOT NULL DEFAULT (datetime('now')),
+    updated_at TEXT NOT NULL DEFAULT (datetime('now')),
+    PRIMARY KEY (scope, ref_id, ip)
+);
+
+CREATE INDEX idx_ip_health_status_scope_ref ON ip_health_status(scope, ref_id);