Delete row sig_28275b551579 from signals

id sig_28275b551579
event_id evt_86ad567122b6
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5170520 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-05T20:15:05Z ...
dedupe_key ta:technical_indicator_signal:priceAboveEma12:ema_ ...
throttle_s 0
created_at 2026-04-08T20:15:05.036497+00:00
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