RFC: message property API

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+From: David Bremner <david@tethera.net>\r
+To: notmuch@notmuchmail.org\r
+Subject: RFC: message property API\r
+Date: Sun, 22 May 2016 11:28:57 -0300\r
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+\r
+People (or maybe just dkg) have proposed various bits of user metadata\r
+to attach to messages\r
+\r
+   - references to be added or blacklisted\r
+   - encryption related key material\r
+\r
+Since such metadata would be not-reproducible from the message files,\r
+it would be "precious" and need a backup/restore path.\r
+\r
+This is a prototype of a library API to support that.\r
+    \r
+Some things to note:\r
+    \r
+    - This is tested on top of my libconfig [1] series, but I think there is no\r
+      logical dependency\r
+    \r
+    - there are no docs, see the tests\r
+    \r
+    - this is just the low level api; it would need to be extended in a\r
+      similar way to the libconfig series to dump and restore metadata.\r
+      This might require modifying/extending the API to dump all properties\r
+      for a message. That should be a relatively small change.\r
+    \r
+    - it also be useful to be able delete all (key,value) pairs with a given\r
+      key.\r
+    \r
+    - this should really go through the existing caching mechanism used by\r
+      e.g. tags, or at least not invalidate that cache.\r
+    \r
+[1] id:1463135893-7471-6-git-send-email-david@tethera.net\r
+\r