Delete row sig_f2e02cb7948a from signals

id sig_f2e02cb7948a
event_id evt_6131cc3b1918
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T11:46:07.891777+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:20dc0f4dfafb2afe
throttle_s 0
created_at 2026-04-20T11:46:07.891777+00:00
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