Setup initial database for feed implementation

- Update the database diagram
- Add new migration for the new tables and fields
- Enable schema exports

app/build.gradle

@@ -35,6 +35,12 @@ android {
 
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         vectorDrawables.useSupportLibrary = true
+
+        javaCompileOptions {
+            annotationProcessorOptions {
+                arguments = ["room.schemaLocation": "$projectDir/schemas".toString()]
+            }
+        }
     }
 
     buildTypes {