Delete row sig_b1d8b6f48be7 from signals

id sig_b1d8b6f48be7
event_id evt_2fac8dc4d18d
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T03:13:37.852148+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:d22826d650256646
throttle_s 0
created_at 2026-04-18T03:13:37.852148+00:00
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