Delete row sig_b6fd7cc9b46e from signals

id sig_b6fd7cc9b46e
event_id evt_d054d96764d3
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T11:58:55.016908+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:e04ce55358db6b1c
throttle_s 0
created_at 2026-04-18T11:58:55.016908+00:00
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