Delete row sig_677b08f7d5ed from signals

id sig_677b08f7d5ed
event_id evt_4ff20c58686a
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-17T23:19:01.553027+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:9fe12ec471865d52
throttle_s 0
created_at 2026-04-17T23:19:01.553027+00:00
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