fix: host key updates not syncing, metrics 404 race on first connect

Host key writes never bumped updatedAt so sync never picked them up.
Also retry the first metrics fetch briefly instead of failing right away.

src/backend/database/repositories/host-resolution-repository.ts

@@ -1,4 +1,4 @@
-import { and, eq, inArray, isNotNull } from "drizzle-orm";
+import { and, eq, inArray, isNotNull, sql } from "drizzle-orm";
 import { hosts, sshCredentials, sshFolders } from "../db/schema.js";
 import type { DatabaseContext } from "./database-context.js";
 import { DataCrypto } from "../../utils/data-crypto.js";
@@ -326,6 +326,7 @@ export class HostResolutionRepository {
         hostKeyAlgorithm: algorithm,
         hostKeyFirstSeen: now,
         hostKeyLastVerified: now,
+        updatedAt: sql`CURRENT_TIMESTAMP`,
       })
       .where(eq(hosts.id, hostId));
     await this.afterWrite();
@@ -347,6 +348,7 @@ export class HostResolutionRepository {
         hostKeyAlgorithm: algorithm,
         hostKeyLastVerified: now,
         hostKeyChangedCount: currentChangeCount + 1,
+        updatedAt: sql`CURRENT_TIMESTAMP`,
       })
       .where(eq(hosts.id, hostId));
     await this.afterWrite();
@@ -358,7 +360,7 @@ export class HostResolutionRepository {
   ): Promise<void> {
     await this.context.drizzle
       .update(hosts)
-      .set({ hostKeyLastVerified: now })
+      .set({ hostKeyLastVerified: now, updatedAt: sql`CURRENT_TIMESTAMP` })
       .where(eq(hosts.id, hostId));
     await (this.onLazyWrite?.() ?? this.afterWrite());
   }