Delete row sig_c70887aca441 from signals

id sig_c70887aca441
event_id evt_6b0a8eedc4c5
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-09T09:39:58.625232+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:d220fc380bc2f806
throttle_s 0
created_at 2026-04-09T09:39:58.625232+00:00
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