remove found_bugs.md and add db.md

sources/syzkaller/db.md

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+---
+status: collected
+title: "syz-db"
+author: Syzkaller Community
+collector: mudongliang
+collected_date: 20240428
+link: https://github.com/google/syzkaller/blob/master/docs/db.md
+---
+
+# syz-db
+
+`syz-db` program can be used to manipulate corpus.db databases that are used
+by syz-managers.
+
+## Build
+
+Build `syz-db` with `make db` or by changing to `tools/syz-db` and run `go build`.
+
+## Options
+
+`syz-db` currently overs the following generic arguments:
+
+```shell
+  -arch string
+    	target arch
+  -os string
+    	target OS
+  -version uint
+    	database version
+  -vv int
+    	verbosity
+```
+
+That can be used with
+
+```
+  syz-db pack dir corpus.db
+```
+
+to pack a database
+
+```
+  syz-db unpack corpus.db dir
+```
+
+to unpack a database. A file containing performed syscalls will be returned.
+
+```
+  syz-db merge dst-corpus.db add-corpus.db* add-prog*
+```
+
+to merge databases. No additional file will be created: The first file will be replaced by the merged result.
+
+```
+  syz-db bench corpus.db
+```
+
+to run a deserialization benchmark. For example:
+
+```
+syz-db -os=linux -arch=amd64 bench corpus.db
+```
+
+could give an output like
+
+```
+allocs 123 MB (123 M), next GC 123 MB, sys heap 123 MB, live allocs 123 MB (123 M), time 324s.
+```