feat(sync): refonte import Takeout complet (playlists, musique, recherches, identité)

server/db.mjs

@@ -409,6 +409,17 @@ export function insertSearchHistory({ userId, query, filters }) {
   return { id, created_at };
 }
 
+/** Variante Takeout : date d'origine conservée (ISO valide exigée). */
+export function insertSearchHistoryAt({ userId, query, createdAt }) {
+  const id = cryptoRandomId();
+  const d = new Date(String(createdAt || ''));
+  const created_at = !Number.isNaN(d.getTime()) ? d.toISOString() : nowIso();
+  db.prepare(`INSERT INTO search_history (id, user_id, query, filters_json, created_at)
+              VALUES (?, ?, ?, ?, ?)`)
+    .run(id, userId, query, null, created_at);
+  return { id, created_at };
+}
+
 export function listSearchHistory({ userId, limit = 50, before, q, provider }) {
   const lim = Math.max(1, Math.min(200, Number(limit) || 50));
   const conds = ['user_id = ?'];