Delete row sig_2be53a4e5ae8 from signals

id sig_2be53a4e5ae8
event_id evt_e312251ee73d
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T08:27:54.846032+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:0894c21146d63a40
throttle_s 0
created_at 2026-04-18T08:27:54.846032+00:00
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