Delete row sig_dc128c39ee57 from signals

id sig_dc128c39ee57
event_id evt_5886a7bb081e
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T20:21:36.868024+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:6f8713078a7e0e59
throttle_s 0
created_at 2026-04-12T20:21:36.868024+00:00
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