use global library watch lock

server/src/domain/library/library.service.ts

@@ -70,8 +70,16 @@ export class LibraryService extends EventEmitter {
 
   async init() {
     const config = await this.configCore.getConfig();
+
     const { watch, scan } = config.library;
-    this.watchLibraries = watch.enabled;
+    this.watchLibraries = false;
+    if (watch.enabled) {
+      this.databaseRepository.withTryLock(DatabaseLock.LibraryWatch, async () => {
+        // This ensures that library watching only occurs in one microservice
+        // TODO: we could make the lock be per-library instead of global
+        this.watchLibraries = true;
+      });
+    }
     this.jobRepository.addCronJob(
       'libraryScan',
       scan.cronExpression,
@@ -106,7 +114,6 @@ export class LibraryService extends EventEmitter {
       return false;
     }
 
-    this.databaseRepository.withTryLock(DatabaseLock.LibraryWatch, async () => {
     await this.unwatch(id);
 
     this.logger.log(`Starting to watch library ${library.id} with import path(s) ${library.importPaths}`);
@@ -159,7 +166,6 @@ export class LibraryService extends EventEmitter {
 
     // Wait for the watcher to initialize before returning
     await ready$;
-    });
 
     return true;
   }