Delete row sig_dff98af523ca from signals

id sig_dff98af523ca
event_id evt_ae24348b35e8
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T04:37:54.790049+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:41344bfd908e8454
throttle_s 0
created_at 2026-04-18T04:37:54.790049+00:00
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