Delete row sig_88e44aa28d71 from signals

id sig_88e44aa28d71
event_id evt_8d40618df193
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.9," ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-05T20:35:04Z ...
dedupe_key ta:technical_indicator_signal:priceAboveEma12:ema_ ...
throttle_s 0
created_at 2026-04-08T20:35:04.790339+00:00
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