Delete row sig_e0c451e8e710 from signals

id sig_e0c451e8e710
event_id evt_e1977a7e701e
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T05:07:15.921783+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:8443a0e17b2180d0
throttle_s 0
created_at 2026-04-20T05:07:15.921783+00:00
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