Delete row sig_a7b7f7389a9c from signals

id sig_a7b7f7389a9c
event_id evt_2f19bd4e39c4
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5331278 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-14T20:24:00Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-17T20:24:00.285898+00:00
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