Delete row sig_a4a8f80e8245 from signals

id sig_a4a8f80e8245
event_id evt_a0c6c5056856
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T10:36:05.886444+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:b17d9bf78e297b9a
throttle_s 0
created_at 2026-04-18T10:36:05.886444+00:00
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