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4a8dc2d445
Fixes a regression introduced in v0.27.0 where node expiry times were being reset to zero when tailscaled restarts and sends a MapRequest. The issue was caused by using GORM's Save() method in persistNodeToDB(), which overwrites ALL fields including zero values. When a MapRequest updates a node (without including expiry information), Save() would overwrite the database expiry field with a zero value. Changed to use Updates() which only updates non-zero values, preserving existing database values when struct pointer fields are nil. In BackfillNodeIPs, we need to explicitly update IPv4/IPv6 fields even when nil (to remove IPs), so we use Select() to specify those fields. Added regression test that validates expiry is preserved after MapRequest. Fixes #2862