feat(channels): align whatsapp calls api

migrations/000034_align_calls_whatsapp_fields.down.sql

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+ALTER TABLE calls DROP COLUMN IF EXISTS end_reason;
+ALTER TABLE calls DROP COLUMN IF EXISTS started_at;

migrations/000034_align_calls_whatsapp_fields.up.sql

@@ -0,0 +1,2 @@
+ALTER TABLE calls ADD COLUMN IF NOT EXISTS started_at TIMESTAMPTZ;
+ALTER TABLE calls ADD COLUMN IF NOT EXISTS end_reason VARCHAR(255);