Delete row sig_84c8da1c937c from signals

id sig_84c8da1c937c
event_id evt_92fc1dc87e98
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-08T02:27:57.607918+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:794e22285983107e
throttle_s 0
created_at 2026-04-08T02:27:57.607918+00:00
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