Delete row sig_e957e1eed090 from signals

id sig_e957e1eed090
event_id evt_d5ee1ac1554a
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-07T06:00:26.373159+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:9ac14ae78271085d
throttle_s 0
created_at 2026-04-07T06:00:26.373159+00:00
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