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## Summary Remove `claude-3-7-sonnet-20250219` from LLM model definitions ahead of Anthropic's API retirement, with comprehensive migration and defensive error handling. ## Background Anthropic is retiring Claude 3.7 Sonnet (`claude-3-7-sonnet-20250219`) on **February 19, 2026 at 9:00 AM PT**. This PR removes the model from the platform and migrates existing users to prevent service interruptions. ## Changes ### Code Changes - Remove `CLAUDE_3_7_SONNET` enum member from `LlmModel` in `llm.py` - Remove corresponding `ModelMetadata` entry - Remove `CLAUDE_3_7_SONNET` from `StagehandRecommendedLlmModel` enum - Remove `CLAUDE_3_7_SONNET` from block cost config - Add `CLAUDE_4_5_SONNET` to `StagehandRecommendedLlmModel` enum - Update Stagehand block defaults from `CLAUDE_3_7_SONNET` to `CLAUDE_4_5_SONNET` (staying in Claude family) - Add defensive error handling in `CredentialsFieldInfo.discriminate()` for deprecated model values ### Database Migration - Adds migration `20260126120000_migrate_claude_3_7_to_4_5_sonnet` - Migrates `AgentNode.constantInput` model references - Migrates `AgentNodeExecutionInputOutput.data` preset overrides ### Documentation - Updated `docs/integrations/block-integrations/llm.md` to remove deprecated model - Updated `docs/integrations/block-integrations/stagehand/blocks.md` to remove deprecated model and add Claude 4.5 Sonnet ## Notes - Agent JSON files in `autogpt_platform/backend/agents/` still reference this model in their provider mappings. These are auto-generated and should be regenerated separately. ## Testing - [ ] Verify LLM block still functions with remaining models - [ ] Confirm no import errors in affected files - [ ] Verify migration runs successfully - [ ] Verify deprecated model gives helpful error message instead of KeyError