Delete row sig_0971be6051a6 from signals

id sig_0971be6051a6
event_id evt_b58d7e907d96
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T19:57:08.646291+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:2de2a437e66d57e5
throttle_s 0
created_at 2026-04-18T19:57:08.646291+00:00
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