changed id type of vector store from uuid to text to make use of deterministic ids

backend/src/main/resources/application.yaml

@@ -23,6 +23,7 @@ spring:
         model: gpt-4o-mini
     vectorstore:
       pgvector:
+        id-type: text
         dimensions: 1536
         distance-type: COSINE_DISTANCE
         index-type: HNSW