Delete row sig_9acaa83cfcd1 from signals

id sig_9acaa83cfcd1
event_id evt_2bb0d08dd508
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-07T09:32:48.463230+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:dc9613a2cc5247b0
throttle_s 0
created_at 2026-04-07T09:32:48.463230+00:00
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