Delete row sig_883f4b80cbf9 from signals

id sig_883f4b80cbf9
event_id evt_517baf19ed97
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-14T13:49:25.900461+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:181c1a883d06e249
throttle_s 0
created_at 2026-04-14T13:49:25.900461+00:00
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