Delete row sig_6d535681ecc6 from signals

id sig_6d535681ecc6
event_id evt_40f8b9764ba4
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-14T10:16:33.856696+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:155749a614e6b748
throttle_s 0
created_at 2026-04-14T10:16:33.856696+00:00
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