server-ts: Fix errors in abstract_becca_entity

src/services/blob-interface.ts

@@ -1,5 +1,5 @@
 export interface Blob {
     blobId: string;
-    content: Buffer;
+    content: string | Buffer;
     utcDateModified: string;
 }

src/services/entity_changes_interface.ts

@@ -6,7 +6,7 @@ export interface EntityChange {
 	entity?: any;
 	positions?: Record<string, string>;
 	hash: string;
-	utcDateChanged: string;
+	utcDateChanged?: string;
 	isSynced: boolean | 1 | 0;
 	isErased: boolean | 1 | 0;
 	componentId?: string | null;

src/services/utils.ts

@@ -24,7 +24,7 @@ function md5(content: crypto.BinaryLike) {
     return crypto.createHash('md5').update(content).digest('hex');
 }
 
-function hashedBlobId(content: string) {
+function hashedBlobId(content: string | Buffer) {
     if (content === null || content === undefined) {
         content = "";
     }