Delete row sig_528e0dcabb12 from signals

id sig_528e0dcabb12
event_id evt_66b2593f5c58
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-07T12:32:39.794148+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:867d52a2f46c8e52
throttle_s 0
created_at 2026-04-07T12:32:39.794148+00:00
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