chore(server): improve log messages (#24744)

* Clarify the "asset not found" log during thumbnail generation: it's about database

* Move not found sidecars to verbose level instead of "old=null, new=null" at debug

* Log memory creation at default level

* Add explicit log for missing exif date time

Instead of: Date and time is undefined using exifTag undefined for asset ...

* Log database migration start/end at default level

Currently, these messages are logged as "debug". But they are not printed
when debug or verbose level is set. This is due to the known limitation:
SystemConfigService sets LogLevel later on, after migrations run.

server/src/repositories/database.repository.ts

@@ -358,7 +358,7 @@ export class DatabaseRepository {
   }
 
   async runMigrations(): Promise<void> {
-    this.logger.debug('Running migrations');
+    this.logger.log('Running migrations');
 
     const migrator = this.createMigrator();
 
@@ -379,7 +379,7 @@ export class DatabaseRepository {
       throw error;
     }
 
-    this.logger.debug('Finished running migrations');
+    this.logger.log('Finished running migrations');
   }
 
   async migrateFilePaths(sourceFolder: string, targetFolder: string): Promise<void> {

server/src/services/media.service.ts

@@ -158,7 +158,7 @@ export class MediaService extends BaseService {
   async handleGenerateThumbnails({ id }: JobOf<JobName.AssetGenerateThumbnails>): Promise<JobStatus> {
     const asset = await this.assetJobRepository.getForGenerateThumbnailJob(id);
     if (!asset) {
-      this.logger.warn(`Thumbnail generation failed for asset ${id}: not found`);
+      this.logger.warn(`Thumbnail generation failed for asset ${id}: not found in database or missing metadata`);
       return JobStatus.Failed;
     }
 

server/src/services/memory.service.ts

@@ -28,6 +28,7 @@ export class MemoryService extends BaseService {
           continue;
         }
 
+        this.logger.log(`Creating memories for ${target.toISO()}`);
         try {
           await Promise.all(users.map((owner) => this.createOnThisDayMemories(owner.id, target)));
         } catch (error) {

server/src/services/metadata.service.ts

@@ -366,9 +366,13 @@ export class MetadataService extends BaseService {
 
     const isChanged = sidecarPath !== sidecarFile?.path;
 
-    this.logger.debug(
-      `Sidecar check found old=${sidecarFile?.path}, new=${sidecarPath} will ${isChanged ? 'update' : 'do nothing for'}  asset ${asset.id}: ${asset.originalPath}`,
-    );
+    if (sidecarFile?.path || sidecarPath) {
+      this.logger.debug(
+        `Sidecar check found old=${sidecarFile?.path}, new=${sidecarPath} will ${isChanged ? 'update' : 'do nothing for'} asset ${asset.id}: ${asset.originalPath}`,
+      );
+    } else {
+      this.logger.verbose(`No sidecars found for asset ${asset.id}: ${asset.originalPath}`);
+    }
 
     if (!isChanged) {
       return JobStatus.Skipped;
@@ -858,9 +862,13 @@ export class MetadataService extends BaseService {
     const result = firstDateTime(exifTags);
     const tag = result?.tag;
     const dateTime = result?.dateTime;
-    this.logger.verbose(
-      `Date and time is ${dateTime} using exifTag ${tag} for asset ${asset.id}: ${asset.originalPath}`,
-    );
+    if (dateTime) {
+      this.logger.verbose(
+        `Date and time is ${dateTime} using exifTag ${tag} for asset ${asset.id}: ${asset.originalPath}`,
+      );
+    } else {
+      this.logger.verbose(`No exif date time information found for asset ${asset.id}: ${asset.originalPath}`);
+    }
 
     // timezone
     let timeZone = exifTags.tz ?? null;