Delete row sig_1dffb7d602ab from signals

id sig_1dffb7d602ab
event_id evt_86427861ba1a
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-18T14:07:10.101799+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:053bd6db065070cb
throttle_s 0
created_at 2026-04-18T14:07:10.101799+00:00
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