feat: from OpenAI use only gpt5 (#211)

- make gpt-5 the default for OpenAI models
- remove all other models from OpenAI as they are deprecated

~~I wasn't able to test this so far because the (apparently)
[organization requires
verification](https://help.openai.com/en/articles/10910291-api-organization-verification)?~~

I tested the following things
- [x] schedule with gpt-5
- [x] chat with gpt-5
- [x] schedule with gpt-4 (it fails with model not found)
- [x] Tested the new migration to update schedule's model to gpt-5
- [x] schedule upgraded from gpt-4 to gpt-5 (it works now)

Pending
- [ ] Test LiteLLM integration
- [ ] Test judge/eval code

<img width="3400" height="1750" alt="image"
src="https://github.com/user-attachments/assets/04d1fe95-2403-4aea-83fe-2f33707fec29"
/>

Author: divyenduz

apps/dbagent/.env.eval.example

@@ -17,6 +17,6 @@ ANTHROPIC_API_KEY=
 GOOGLE_GENERATIVE_AI_API_KEY=
 
 # Eval variables
-JUDGE_MODEL="openai:gpt-4o"
+JUDGE_MODEL="openai:gpt-5"
 CHAT_MODEL="anthropic:claude-3-5-haiku"
 EVAL_FOLDER="/my/folder"

apps/dbagent/dev/litellm/etc/config.yaml

@@ -1,22 +1,27 @@
 model_list:
-  - model_name: GPT-4o
+  - model_name: GPT-5
     litellm_params:
-      model: openai/gpt-4o
+      model: openai/gpt-5
     model_info:
       xata_agent:
         group_fallback: openai
         alias:
-          - title
-          - summary
-  - model_name: GPT-4 Turbo
-    litellm_params:
-      model: openai/gpt-4-turbo
-  - model_name: GPT-4.1
+          - chat
+  - model_name: GPT-5 Turbo
     litellm_params:
-      model: openai/gpt-4.1
-  - model_name: GPT-4.1 Mini
+      model: openai/gpt-5-turbo
+    model_info:
+      xata_agent:
+        group_fallback: openai
+  - model_name: GPT-5 Mini
     litellm_params:
-      model: openai/gpt-4.1-mini
+      model: openai/gpt-5-mini
+    model_info:
+      xata_agent:
+        group_fallback: openai
+        alias:
+          - title
+          - summary
 
   - model_name: DeepSeek Chat
     litellm_params:

apps/dbagent/migrations/0010_gpt5_migration.sql

@@ -0,0 +1,3 @@
+UPDATE "schedules"
+SET "model" = 'openai:gpt-5'
+WHERE "model" LIKE 'openai%';