Alternative (raw) message store (i.e. instead of maildir)

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+ <CA+Tk8fwq2thNeKHgfG-EX0hgR7uyqrSce0ZMOhEJBsz1RVtRqg@mail.gmail.com>\r
+Subject: Alternative (raw) message store (i.e. instead of maildir)\r
+From: Ciprian Dorin Craciun <ciprian.craciun@gmail.com>\r
+To: notmuch@notmuchmail.org\r
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+\r
+    Hello all!\r
+\r
+    My question -- rather a curiosity -- is if one could easily\r
+implement an alternative message store instead of maildir. (I actually\r
+have in mind a KV store like BerkeleyDB, or even a database like\r
+CouchDB...) (I'm not also implying the same for the index, which I'm\r
+aware is based on Xapian, which requires BerkeleyDB, which in turn\r
+needs a local file system.)\r
+\r
+    After quickly looking over the code (2 minutes actually) I saw\r
+that currently this is not easily possible without touching a lot of\r
+files... Or am I wrong?\r
+\r
+    Better said: is such an abstract email store interface on the\r
+to-do list, or even acceptable to have if someone provides it?\r
+\r
+    Thanks,\r
+    Ciprian.\r