Delete row sig_52d0da4e75cb from signals

id sig_52d0da4e75cb
event_id evt_a61bf40b89b6
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-09T06:40:44.138014+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:3719e61d83376606
throttle_s 0
created_at 2026-04-09T06:40:44.138014+00:00
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