Delete row sig_1c77469320f1 from signals

id sig_1c77469320f1
event_id evt_ceddc7e46979
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T05:28:17.000463+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:b63886c971443171
throttle_s 0
created_at 2026-04-20T05:28:17.000463+00:00
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