Save and display timeToComplete on model outputs (#6)

* Calculate and save timeToComplete on model outputs

* Add output stats to function call as well

* Record timeToComplete before parsing response json

* Add default value for timeToComplete

prisma/schema.prisma

@@ -76,10 +76,11 @@ model TemplateVariable {
 model ModelOutput {
     id String @id @default(uuid()) @db.Uuid
 
-    inputHash    String
-    output       Json
-    statusCode   Int
-    errorMessage String?
+    inputHash      String
+    output         Json
+    statusCode     Int
+    errorMessage   String?
+    timeToComplete Int  @default(0)
 
     promptVariantId String        @db.Uuid
     promptVariant   PromptVariant @relation(fields: [promptVariantId], references: [id], onDelete: Cascade)