Add function handling for OpenAI model

for now it's querying only time, but in the future there will be more commands

schema.prisma

@@ -8,12 +8,15 @@ datasource db {
 }
 
 model Usage {
-  timestamp DateTime @id
+  @@id([timestamp, functionRan])
+  timestamp DateTime
   user BigInt
   channel BigInt
   guild BigInt?
   usageReguest Int
   usageResponse Int
+  functionName String?
+  functionRan Int @default(0)
 }
 
 model Limits {