Delete row sig_bc21320a8db6 from signals

id sig_bc21320a8db6
event_id evt_8a5c62b6593a
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.6122006 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-18T21:48:08Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-21T21:48:08.797012+00:00
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