Delete auto-RSVP on unclaim and count going from RSVPs only

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

db/queries.sql

@@ -49,6 +49,9 @@ INSERT INTO claims (slot_id, name, note)
 VALUES (?, ?, ?)
 RETURNING *;
 
+-- name: GetClaimByID :one
+SELECT * FROM claims WHERE id = ?;
+
 -- name: DeleteClaim :exec
 DELETE FROM claims WHERE id = ?;