Delete row sig_9820261aae09 from signals

id sig_9820261aae09
event_id evt_c919dbd40aea
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":268,"confidence":0.5645219 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-12T20:14:04Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-15T20:14:04.346452+00:00
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