Delete row sig_980443c8a3f8 from signals

id sig_980443c8a3f8
event_id evt_872c9f972970
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-16T13:08:24.963148+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:58478f23822aff36
throttle_s 0
created_at 2026-04-16T13:08:24.963148+00:00
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