Delete row sig_28b3392d8074 from signals

id sig_28b3392d8074
event_id evt_e29d2665da19
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-22T08:40:32.511923+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:f85cb93ad0e8b96c
throttle_s 0
created_at 2026-04-22T08:40:32.511923+00:00
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