Delete row sig_28018e4cf508 from signals

id sig_28018e4cf508
event_id evt_b5fed5e03413
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T02:40:51.505179+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:0c2b4b066849738e
throttle_s 0
created_at 2026-04-18T02:40:51.505179+00:00
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