Delete row sig_47335a41415b from signals

id sig_47335a41415b
event_id evt_0de0607cfd0c
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-11T07:33:17.424809+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:148a659f4d8bb08a
throttle_s 0
created_at 2026-04-11T07:33:17.424809+00:00
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