Update index & offset encoding

Previously, the index & offsets were encoded as 8-character hex
strings, however, this limits the maximum value to a `uint32`. This
is normally not an issue, however, indices could go over the maximum
value of 4 billion over time and the offset could exceed this value
for an especially large WAL update. For safety, these encodings have
been updated to 16-character hex encodings.

testdata/find-latest-generation/ok/Makefile

@@ -1,7 +1,7 @@
 .PHONY: default
 default:
-	TZ=UTC touch -ct 200001010000 generations/0000000000000000/snapshots/00000000.snapshot.lz4
-	TZ=UTC touch -ct 200001020000 generations/0000000000000000/snapshots/00000001.snapshot.lz4
-	TZ=UTC touch -ct 200001010000 generations/0000000000000001/snapshots/00000000.snapshot.lz4
-	TZ=UTC touch -ct 200001030000 generations/0000000000000001/snapshots/00000001.snapshot.lz4
-	TZ=UTC touch -ct 200001010000 generations/0000000000000002/snapshots/00000000.snapshot.lz4
+	TZ=UTC touch -ct 200001010000 generations/0000000000000000/snapshots/0000000000000000.snapshot.lz4
+	TZ=UTC touch -ct 200001020000 generations/0000000000000000/snapshots/0000000000000001.snapshot.lz4
+	TZ=UTC touch -ct 200001010000 generations/0000000000000001/snapshots/0000000000000000.snapshot.lz4
+	TZ=UTC touch -ct 200001030000 generations/0000000000000001/snapshots/0000000000000001.snapshot.lz4
+	TZ=UTC touch -ct 200001010000 generations/0000000000000002/snapshots/0000000000000000.snapshot.lz4

testdata/generation-time-bounds/ok/Makefile

@@ -1,8 +1,8 @@
 .PHONY: default
 default:
-	TZ=UTC touch -ct 200001010000 generations/0000000000000000/snapshots/00000000.snapshot.lz4
-	TZ=UTC touch -ct 200001020000 generations/0000000000000000/snapshots/00000001.snapshot.lz4
-	TZ=UTC touch -ct 200001010000 generations/0000000000000000/wal/00000000/00000000.wal.lz4
-	TZ=UTC touch -ct 200001020000 generations/0000000000000000/wal/00000000/00000001.wal.lz4
-	TZ=UTC touch -ct 200001030000 generations/0000000000000000/wal/00000001/00000000.wal.lz4
+	TZ=UTC touch -ct 200001010000 generations/0000000000000000/snapshots/0000000000000000.snapshot.lz4
+	TZ=UTC touch -ct 200001020000 generations/0000000000000000/snapshots/0000000000000001.snapshot.lz4
+	TZ=UTC touch -ct 200001010000 generations/0000000000000000/wal/0000000000000000/0000000000000000.wal.lz4
+	TZ=UTC touch -ct 200001020000 generations/0000000000000000/wal/0000000000000000/0000000000000001.wal.lz4
+	TZ=UTC touch -ct 200001030000 generations/0000000000000000/wal/0000000000000001/0000000000000000.wal.lz4
 

testdata/generation-time-bounds/snapshots-only/Makefile

@@ -1,5 +1,5 @@
 .PHONY: default
 default:
-	TZ=UTC touch -ct 200001010000 generations/0000000000000000/snapshots/00000000.snapshot.lz4
-	TZ=UTC touch -ct 200001020000 generations/0000000000000000/snapshots/00000001.snapshot.lz4
+	TZ=UTC touch -ct 200001010000 generations/0000000000000000/snapshots/0000000000000000.snapshot.lz4
+	TZ=UTC touch -ct 200001020000 generations/0000000000000000/snapshots/0000000000000001.snapshot.lz4
 

testdata/max-snapshot-index/ok/Makefile

@@ -1,6 +1,6 @@
 .PHONY: default
 default:
-	TZ=UTC touch -ct 200001020000 generations/0000000000000000/snapshots/00000000.snapshot.lz4
-	TZ=UTC touch -ct 200001010000 generations/0000000000000001/snapshots/00000000.snapshot.lz4
-	TZ=UTC touch -ct 200001030000 generations/0000000000000001/snapshots/00000001.snapshot.lz4
-	TZ=UTC touch -ct 200001010000 generations/0000000000000002/snapshots/00000000.snapshot.lz4
+	TZ=UTC touch -ct 200001020000 generations/0000000000000000/snapshots/0000000000000000.snapshot.lz4
+	TZ=UTC touch -ct 200001010000 generations/0000000000000001/snapshots/0000000000000000.snapshot.lz4
+	TZ=UTC touch -ct 200001030000 generations/0000000000000001/snapshots/0000000000000001.snapshot.lz4
+	TZ=UTC touch -ct 200001010000 generations/0000000000000002/snapshots/0000000000000000.snapshot.lz4

testdata/replica-client-time-bounds/ok/Makefile

@@ -1,6 +1,6 @@
 .PHONY: default
 default:
-	TZ=UTC touch -ct 200001020000 generations/0000000000000000/snapshots/00000000.snapshot.lz4
-	TZ=UTC touch -ct 200001010000 generations/0000000000000001/snapshots/00000000.snapshot.lz4
-	TZ=UTC touch -ct 200001030000 generations/0000000000000001/snapshots/00000001.snapshot.lz4
-	TZ=UTC touch -ct 200001010000 generations/0000000000000002/snapshots/00000000.snapshot.lz4
+	TZ=UTC touch -ct 200001020000 generations/0000000000000000/snapshots/0000000000000000.snapshot.lz4
+	TZ=UTC touch -ct 200001010000 generations/0000000000000001/snapshots/0000000000000000.snapshot.lz4
+	TZ=UTC touch -ct 200001030000 generations/0000000000000001/snapshots/0000000000000001.snapshot.lz4
+	TZ=UTC touch -ct 200001010000 generations/0000000000000002/snapshots/0000000000000000.snapshot.lz4

testdata/restore/bad-permissions/README

@@ -5,9 +5,9 @@ To reproduce this testdata, run sqlite3 and execute:
 	INSERT INTO t (x) VALUES (1);
 	INSERT INTO t (x) VALUES (2);
 
-	sl3 split -o generations/0000000000000000/wal/00000000 db-wal
-	cp db generations/0000000000000000/snapshots/00000000.snapshot
-	lz4 -c --rm generations/0000000000000000/snapshots/00000000.snapshot
+	sl3 split -o generations/0000000000000000/wal/0000000000000000 db-wal
+	cp db generations/0000000000000000/snapshots/0000000000000000.snapshot
+	lz4 -c --rm generations/0000000000000000/snapshots/0000000000000000.snapshot
 
 
 Then execute:
@@ -15,7 +15,7 @@ Then execute:
 	PRAGMA wal_checkpoint(TRUNCATE);
 	INSERT INTO t (x) VALUES (3);
 
-	sl3 split -o generations/0000000000000000/wal/00000001 db-wal
+	sl3 split -o generations/0000000000000000/wal/0000000000000001 db-wal
 
 
 Then execute:
@@ -24,13 +24,13 @@ Then execute:
 	INSERT INTO t (x) VALUES (4);
 	INSERT INTO t (x) VALUES (5);
 
-	sl3 split -o generations/0000000000000000/wal/00000002 db-wal
+	sl3 split -o generations/0000000000000000/wal/0000000000000002 db-wal
 
 
 Finally, obtain the final snapshot:
 
 	PRAGMA wal_checkpoint(TRUNCATE);
 
-	cp db 00000002.db
+	cp db 0000000000000002.db
 	rm db*
 

testdata/restore/ok/README

@@ -5,9 +5,9 @@ To reproduce this testdata, run sqlite3 and execute:
 	INSERT INTO t (x) VALUES (1);
 	INSERT INTO t (x) VALUES (2);
 
-	sl3 split -o generations/0000000000000000/wal/00000000 db-wal
-	cp db generations/0000000000000000/snapshots/00000000.snapshot
-	lz4 -c --rm generations/0000000000000000/snapshots/00000000.snapshot
+	sl3 split -o generations/0000000000000000/wal/0000000000000000 db-wal
+	cp db generations/0000000000000000/snapshots/0000000000000000.snapshot
+	lz4 -c --rm generations/0000000000000000/snapshots/0000000000000000.snapshot
 
 
 Then execute:
@@ -15,7 +15,7 @@ Then execute:
 	PRAGMA wal_checkpoint(TRUNCATE);
 	INSERT INTO t (x) VALUES (3);
 
-	sl3 split -o generations/0000000000000000/wal/00000001 db-wal
+	sl3 split -o generations/0000000000000000/wal/0000000000000001 db-wal
 
 
 Then execute:
@@ -24,13 +24,13 @@ Then execute:
 	INSERT INTO t (x) VALUES (4);
 	INSERT INTO t (x) VALUES (5);
 
-	sl3 split -o generations/0000000000000000/wal/00000002 db-wal
+	sl3 split -o generations/0000000000000000/wal/0000000000000002 db-wal
 
 
 Finally, obtain the final snapshot:
 
 	PRAGMA wal_checkpoint(TRUNCATE);
 
-	cp db 00000002.db
+	cp db 0000000000000002.db
 	rm db*
 

testdata/snapshot-time-bounds/ok/Makefile

@@ -1,6 +1,6 @@
 .PHONY: default
 default:
-	TZ=UTC touch -ct 200001010000 generations/0000000000000000/snapshots/00000000.snapshot.lz4
-	TZ=UTC touch -ct 200001020000 generations/0000000000000000/snapshots/00000001.snapshot.lz4
-	TZ=UTC touch -ct 200001030000 generations/0000000000000000/snapshots/00000002.snapshot.lz4
+	TZ=UTC touch -ct 200001010000 generations/0000000000000000/snapshots/0000000000000000.snapshot.lz4
+	TZ=UTC touch -ct 200001020000 generations/0000000000000000/snapshots/0000000000000001.snapshot.lz4
+	TZ=UTC touch -ct 200001030000 generations/0000000000000000/snapshots/0000000000000002.snapshot.lz4
 

testdata/wal-downloader/ok/README

@@ -7,8 +7,8 @@ To reproduce this testdata, run sqlite3 and execute:
 
 And copy & split the WAL into segments:
 
-	sl3 split -o generations/0000000000000000/wal/00000000 db-wal
-	cp db-wal 00000000.wal
+	sl3 split -o generations/0000000000000000/wal/0000000000000000 db-wal
+	cp db-wal 0000000000000000.wal
 
 
 Then execute:
@@ -18,8 +18,8 @@ Then execute:
 
 And split again:
 
-	sl3 split -o generations/0000000000000000/wal/00000001 db-wal
-	cp db-wal 00000001.wal
+	sl3 split -o generations/0000000000000000/wal/0000000000000001 db-wal
+	cp db-wal 0000000000000001.wal
 
 
 Then execute:
@@ -30,8 +30,8 @@ Then execute:
 
 And split again:
 
-	sl3 split -o generations/0000000000000000/wal/00000002 db-wal
-	cp db-wal 00000002.wal
+	sl3 split -o generations/0000000000000000/wal/0000000000000002 db-wal
+	cp db-wal 0000000000000002.wal
 
 
 Finally, remove the original database files:

testdata/wal-downloader/one/README

@@ -7,8 +7,8 @@ To reproduce this testdata, run sqlite3 and execute:
 
 And copy & split the WAL into segments:
 
-	sl3 split -o generations/0000000000000000/wal/00000000 db-wal
-	cp db-wal 00000000.wal
+	sl3 split -o generations/0000000000000000/wal/0000000000000000 db-wal
+	cp db-wal 0000000000000000.wal
 
 
 Finally, remove the original database files:

testdata/wal-time-bounds/ok/Makefile

@@ -1,6 +1,6 @@
 .PHONY: default
 default:
-	TZ=UTC touch -ct 200001010000 generations/0000000000000000/wal/00000000/00000000.wal.lz4
-	TZ=UTC touch -ct 200001020000 generations/0000000000000000/wal/00000000/00000001.wal.lz4
-	TZ=UTC touch -ct 200001030000 generations/0000000000000000/wal/00000001/00000000.wal.lz4
+	TZ=UTC touch -ct 200001010000 generations/0000000000000000/wal/0000000000000000/0000000000000000.wal.lz4
+	TZ=UTC touch -ct 200001020000 generations/0000000000000000/wal/0000000000000000/0000000000000001.wal.lz4
+	TZ=UTC touch -ct 200001030000 generations/0000000000000000/wal/0000000000000001/0000000000000000.wal.lz4