chore: consolidate migrations into single free_limit_exceeded TEXT column

Removed the old BOOLEAN migration and updated the remaining migration
to add the TEXT column directly.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: 2 people

supabase/migrations/20260107000000_add_free_limit_exceeded.sql

@@ -1,10 +1,7 @@
--- Change free_limit_exceeded from BOOLEAN to TEXT (YYYY-MM format)
--- This allows tracking which month the limit was exceeded
--- NULL = not exceeded, "2026-01" = exceeded in January 2026
+-- Add free_limit_exceeded column to track which month the free tier limit was exceeded
+-- Stores month in YYYY-MM format (e.g., "2026-01" = exceeded in January 2026)
+-- NULL = not exceeded or under limit
+-- When set, request/response bodies are not stored for non-PTB requests
 
--- Drop the old boolean column
-ALTER TABLE organization DROP COLUMN IF EXISTS free_limit_exceeded;
-
--- Add new text column for month tracking
 ALTER TABLE organization
-ADD COLUMN free_limit_exceeded TEXT DEFAULT NULL;
+ADD COLUMN IF NOT EXISTS free_limit_exceeded TEXT DEFAULT NULL;