Delete row sig_7786805e96b6 from signals

id sig_7786805e96b6
event_id evt_d189a86be8ec
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T14:25:15.490667+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:577409c956319216
throttle_s 0
created_at 2026-04-12T14:25:15.490667+00:00
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