Delete row sig_ebc858e9b29c from signals

id sig_ebc858e9b29c
event_id evt_19e02c6c8266
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-09T16:31:15.228818+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:7da0321d40a376f5
throttle_s 0
created_at 2026-04-09T16:31:15.228818+00:00
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