Delete row sig_c81d625af1fe from signals

id sig_c81d625af1fe
event_id evt_9ae618fe7fb0
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-14T23:49:38.328712+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:70bc803dd83fd237
throttle_s 0
created_at 2026-04-14T23:49:38.328712+00:00
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