Delete row sig_e98d989bd1bb from signals

id sig_e98d989bd1bb
event_id evt_f87b08f16c6e
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-09T19:14:21.820247+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:517a2a41b5bce3f4
throttle_s 0
created_at 2026-04-09T19:14:21.820247+00:00
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