Delete row sig_0b15a7c7a700 from signals

id sig_0b15a7c7a700
event_id evt_02fd44d1813a
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-18T12:31:13.470349+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:8d5ef3a65149dbdb
throttle_s 0
created_at 2026-04-18T12:31:13.470349+00:00
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