Fix flyway migration and use h2 in unit tests.

README.md

@@ -5,28 +5,10 @@
 ```mermaid
 classDiagram
     class Activity {
-        +Long id
         +String name
         +Location location
-        +Integer priceRange
+        +Int priceRange
         +List~String~ tags
-        +String description
-        +LocalDateTime createdAt
-        +LocalDateTime updatedAt
     }
-    
-    class Location {
-        +Long id
-        +String name
-        +String address
-        +String city
-        +String country
-        +String postalCode
-        +Double latitude
-        +Double longitude
-        +LocalDateTime createdAt
-        +LocalDateTime updatedAt
-    }
-    
-    Activity <-- Location : belongs to
 ```
+

backend/src/main/resources/application.yml

@@ -1,5 +1,5 @@
 server:
-  port: 8090
+  port: 8080
   servlet:
     context-path: /api
 
@@ -9,7 +9,7 @@ spring:
   
   # Database Configuration
   datasource:
-    url: jdbc:postgresql://dind:5432/vibing
+    url: jdbc:postgresql://localhost:5432/vibing
     username: vibing
     password: vibing
     driver-class-name: org.postgresql.Driver

local-dev/compose.yml

@@ -9,6 +9,3 @@ services:
       POSTGRES_DB: vibing
     volumes:
       - postgres_data:/var/lib/postgresql/data
-
-volumes:
-  postgres_data: