Delete row sig_b411952fa186 from signals

id sig_b411952fa186
event_id evt_f727efd1af98
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-10T05:17:42.991927+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:abe9bd74d7503401
throttle_s 0
created_at 2026-04-10T05:17:42.991927+00:00
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