Delete row sig_9a30dcc1dadb from signals

id sig_9a30dcc1dadb
event_id evt_e8f9f00d3030
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.7542293 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-06T20:17:55Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-09T20:17:55.410532+00:00
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