feat: add transfer fields to deposits table

supabase/migrations/20260208_add_deposit_transfer_fields.sql

@@ -0,0 +1,12 @@
+-- Add transfer-related fields to tg_deposits
+ALTER TABLE tg_deposits
+  ADD COLUMN IF NOT EXISTS retry_count INTEGER DEFAULT 0,
+  ADD COLUMN IF NOT EXISTS transfer_tx_hash TEXT,
+  ADD COLUMN IF NOT EXISTS last_error TEXT,
+  ADD COLUMN IF NOT EXISTS completed_at TIMESTAMPTZ,
+  ADD COLUMN IF NOT EXISTS failed_at TIMESTAMPTZ;
+
+-- Index for faster queries
+CREATE INDEX IF NOT EXISTS idx_deposits_status_retry
+  ON tg_deposits(status, retry_count)
+  WHERE status = 'confirming';