switch to use protobuf for internal data structure in DB

TODO.md

@@ -1,5 +1,35 @@
+## Features
+
 - repl
 - mime-type => exec app + value
 - add waitgroup to db.go funcs
 - RestList does not support any params?
-- lc() incoming tags
+- lc() incoming tags+keys
+
+## DB Structure
+
+- put tags into sub bucket see #1
+- change structure to:
+
+data bucket
+key => {key,value[0:60],isbin:bool}
+
+value bucket
+key => value (maybe always use []byte here)
+
+tags bucket
+key/tag => tag/key
+tag/key => tag
+
+So, list just uses the data bucket, no large contents.
+A tag search only looksup matching tags, see #1.
+Only a full text search and get would need to dig into the value bucket.
+
+A delete would just delete all keys from all values and then:
+lookup in tags bucket for all key/*, then iterate over the values and
+remove all tag/key's. Then deleting a key would not leave any residue
+behind.
+
+However, maybe change the list command to just list everything and add
+an extra find command for fulltext or tag search. Maybe still provide
+filter options in list command but only filter for keys.