Delete row sig_91e7a9f8f5e3 from signals

id sig_91e7a9f8f5e3
event_id evt_dde0d5e4ae61
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.7419925 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-07T20:45:16Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-10T20:45:16.804857+00:00
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