Delete row sig_3eb77f21ff69 from signals

id sig_3eb77f21ff69
event_id evt_f7386abc3f60
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T08:17:50.187490+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:3521c09edba4c05e
throttle_s 0
created_at 2026-04-18T08:17:50.187490+00:00
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