Delete row sig_e5fa0ff575f2 from signals

id sig_e5fa0ff575f2
event_id evt_c9d835a37e1b
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T04:48:00.051915+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:1a36807643c86656
throttle_s 0
created_at 2026-04-18T04:48:00.051915+00:00
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