Bad block, uncle header invalid, nonce invalid, database corrupted

[JasonCoombs]

The bad block event shown below wouldn't have been a problem, per se, but after I stopped and restarted Geth it mysteriously re-wrote the genesis block, ignoring the fully-synchronized blockchain data already present. Didn't know how to restore/fix the database in-place so I reverted to backups.

System information

$ geth version
Geth
Version: 1.4.9-stable
Protocol Versions: [63 62 61]
Network Id: 1
Go Version: go1.6.2
OS: windows

I0705 04:09:41.152047 core/blockchain.go:972] imported 1 block(s) (0 queued 0 ignored) including 1 txs in 96.0055ms. #1829597 [d7bb8d40 / d
7bb8d40]                                                                                                                                   
I0705 04:10:36.452210 core/blockchain.go:972] imported 1 block(s) (0 queued 0 ignored) including 9 txs in 35.002ms. #1829598 [6dc1870b / 6d
c1870b]                                                                                                                                    
I0705 04:10:52.912151 core/blockchain.go:972] imported 1 block(s) (0 queued 0 ignored) including 27 txs in 48.0027ms. #1829599 [aac07f16 / 
aac07f16]                                                                                                                                  
I0705 04:11:00.081561 core/blockchain.go:972] imported 1 block(s) (0 queued 0 ignored) including 7 txs in 17.001ms. #1829600 [2c753931 / 2c
753931]                                                                                                                                    
I0705 04:11:10.037131 core/blockchain.go:972] imported 1 block(s) (0 queued 0 ignored) including 5 txs in 14.0008ms. #1829601 [51a48999 / 5
1a48999]                                                                                                                                   
I0705 04:11:17.387551 core/blockchain.go:972] imported 1 block(s) (0 queued 0 ignored) including 4 txs in 15.0008ms. #1829602 [7927c616 / 7
927c616]                                                                                                                                   
E0705 04:11:24.176939 core/blockchain.go:1136] Bad block #1829603 (0x42c031b5ee7731203e72c3ae0ce14172a5bb6d657e4c177f3f93b89f26b9b6d8)     
E0705 04:11:24.176939 core/blockchain.go:1137]     uncle[0](e0563cab) header invalid: nonce for #1829598 [e0563cab41a9f1d02d81f4b172dd14852
4514c3b477b4896a264ef3b19fa9392…] is invalid (got 17780421374252739251)                                                                    
I0705 04:11:24.177940 eth/fetcher/fetcher.go:771] Peer 271970e37318e023: block #1829603 [42c031b5…] import failed: uncle[0](e0563cab) heade
r invalid: nonce for #1829598 [e0563cab41a9f1d02d81f4b172dd148524514c3b477b4896a264ef3b19fa9392…] is invalid (got 17780421374252739251) 

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