Delete row sig_c655969857af from signals

id sig_c655969857af
event_id evt_de8d76a5e877
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-17T01:27:17.961986+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:08dec98ab897dc1a
throttle_s 0
created_at 2026-04-17T01:27:17.961986+00:00
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