Delete row sig_d89f722f07b9 from signals

id sig_d89f722f07b9
event_id evt_b832db88923d
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T14:07:05.745243+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:053bd6db065070cb
throttle_s 0
created_at 2026-04-18T14:07:05.745243+00:00
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