Delete row sigfp:signal_enriched:discovery_ipo_delta:64f559d551f9351b from signal_fps

fp sigfp:signal_enriched:discovery_ipo_delta:64f559d5 ...
status open
signal_type discovery_ipo_delta
signal_id sig_e42b4d72035e
watcher_id NULL
created_at 2026-04-18T00:31:08.322803+00:00
updated_at 2026-04-18T00:31:08.322803+00:00
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