Delete row sig_bffdb4c2352a from signals

id sig_bffdb4c2352a
event_id evt_58146ca07a90
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T10:14:05.454714+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:858fe4602f48e35f
throttle_s 0
created_at 2026-04-18T10:14:05.454714+00:00
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