adding chat features, admin features and bug fixes

backend/src/database/migrations/023_create_monitored_services.sql

@@ -0,0 +1,13 @@
+CREATE TABLE IF NOT EXISTS monitored_services (
+    id         UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+    name       VARCHAR(200) NOT NULL,
+    url        VARCHAR(500) NOT NULL,
+    type       VARCHAR(20) NOT NULL DEFAULT 'custom' CHECK (type IN ('internal','custom')),
+    is_active  BOOLEAN NOT NULL DEFAULT TRUE,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE OR REPLACE TRIGGER update_monitored_services_updated_at
+    BEFORE UPDATE ON monitored_services
+    FOR EACH ROW EXECUTE FUNCTION update_updated_at_column();