Delete row sig_b48097fe45d9 from signals

id sig_b48097fe45d9
event_id evt_5bf27bd33133
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-14T09:22:55.654565+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:e2a4cfacf94b2a09
throttle_s 0
created_at 2026-04-14T09:22:55.654565+00:00
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