Delete row sig_78bf48837e7a from signals

id sig_78bf48837e7a
event_id evt_312354f85248
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-14T21:29:01.784895+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:05944b0ff53cc7f0
throttle_s 0
created_at 2026-04-14T21:29:01.784895+00:00
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