Delete row sig_46c48e0dc84f from signals

id sig_46c48e0dc84f
event_id evt_c4ee1b914117
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-12T06:31:39.533072+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:0ec4b6d68bf4cbfa
throttle_s 0
created_at 2026-04-12T06:31:39.533072+00:00
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