Delete row sig_1a0f8ef77c7a from signals

id sig_1a0f8ef77c7a
event_id evt_7a79f9235d6d
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-10T21:57:50.164863+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:6d7f14365f5c3c95
throttle_s 0
created_at 2026-04-10T21:57:50.164863+00:00
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