Delete row sig_da2417454194 from signals

id sig_da2417454194
event_id evt_88295c0c7e1f
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-11T22:23:18.991940+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:a289ea47ce1e21c1
throttle_s 0
created_at 2026-04-11T22:23:18.991940+00:00
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