Delete row sig_abb2ad74346a from signals

id sig_abb2ad74346a
event_id evt_82b97adb9eb8
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-13T10:04:56.503173+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:c4b12021f96b0174
throttle_s 0
created_at 2026-04-13T10:04:56.503173+00:00
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