Delete row sig_27c4f90fb410 from signals

id sig_27c4f90fb410
event_id evt_fdf95072577e
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T00:34:03.157505+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:953c6984bec5bf13
throttle_s 0
created_at 2026-04-18T00:34:03.157505+00:00
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