Delete row sig_e1bf8ab9e909 from signals

id sig_e1bf8ab9e909
event_id evt_cb072f55c8fa
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-08T03:57:42.408643+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:fe884dde9adec8f8
throttle_s 0
created_at 2026-04-08T03:57:42.408643+00:00
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