diff --git a/supabase/migrations/20260630210000_create_email_send_log.sql b/supabase/migrations/20260630210000_create_email_send_log.sql
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index 0000000..6e554d3
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+++ b/supabase/migrations/20260630210000_create_email_send_log.sql
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+-- Durable log of every POST /api/emails attempt (recoupable/chat#1829).
+--
+-- When an empty/footer-only "Message from Recoup" email reached customers, we
+-- could not recover what the API received: malformed bodies were swallowed, the
+-- route logged nothing, and the agent sandbox that built the request is
+-- ephemeral. This records every attempt — sent, send_failed, and rejected
+-- (empty/malformed) — with a copy of the body,
+-- so a send is debuggable several days back. Written by api `logEmailAttempt`.
+--
+-- Append-only; loose ids, no FKs (like error_logs — a log shouldn't
+-- cascade-delete with accounts, and rejected rows have no ids). Keyed by chat_id
+-- only: chats.session_id reaches the session and sessions.account_id the account,
+-- so session_id would be redundant (and isn't in the /api/emails contract).
+-- account_id is denormalized (free at the API, the main query dimension).
+-- Single responsibility = "what the API was asked to send"; Resend delivery
+-- lifecycle is a future, separate concern keyed off resend_id.
+
+CREATE TABLE IF NOT EXISTS public.email_send_log (
+    id          UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+    created_at  TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT now(),
+    account_id  UUID,            -- sender account (denormalized)
+    chat_id     TEXT,            -- chat the send belongs to (chats.id is text); join chats.session_id for the session
+    status      TEXT NOT NULL,   -- 'sent' | 'send_failed' | 'rejected'
+    resend_id   TEXT,            -- Resend message id (forward hook for delivery events)
+    raw_body    TEXT,            -- the request body as received (full; bounded by the platform request-size limit)
+    error       TEXT
+);
+
+CREATE INDEX IF NOT EXISTS email_send_log_created_at_idx ON public.email_send_log (created_at DESC);
+CREATE INDEX IF NOT EXISTS email_send_log_account_id_idx ON public.email_send_log (account_id);