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1# 2017-11-14
3* alter websocket server API to allow for multiple representations (JSON, text, or HTML) to be selected and returned simultaneously
4* add jupyter kernel for TutorialD interpreter
5* fix warnings suggested by new hlint 2.0.10
6
7# 2017-10-08 (v0.3)
9* replaced overuse of `undefined` with `Proxy` in `Tupleable` and `Atomable` typeclasses
10* allow notifications to return query results from before *and* after the commit which triggered the notification
11* alert users in `tutd` console before a transaction graph expression is evaluated which would throw out their changes
12* drastically-improved CSV import/export now supports all possible types except `RelationAtom`
13* fix serious file handle leaks when using on-disk persistence
14* fix case where invalid number of arguments to `ConstructedAtom` did not result in an error
15* add support for `IntegerAtom` (previously, only `IntAtom` was supported)
17# 2017-09-16 (v0.2)
19* a new [simple client API](https://github.com/agentm/project-m36/blob/master/docs/simple_api.markdown) with a monadic transaction manager
20* complete hlint compliance
21* the generics-based [Tupleable typeclass]( https://github.com/agentm/project-m36/blob/master/docs/tupleable.markdown
22) which makes it easy to marshal Haskell data types to-and-from the database
23* timestamps attached to transactions to allow specific point-in-time travel
24* autoMergeToHead, a variant of commit which attempts to merge and commit to the latest head transaction to reduce incidents of TransactionNotAHeadErrors
25* interval data types
26* transaction dirtiness detection which allows the client to determine if an update expression actually changed the database state
28# 2017-08-01
30## autoMergeToHead
32In preparation for the simpler monad client API, ProjectM36.Client now includes a server-side merge for new transactions called "[automerge](https://github.com/agentm/project-m36/issues/33)". This feature should reduce head contention in cases where new transactions can be simply merged to the head without additional processing. The trade-off is reduced ```TransactionIsNotAHeadError```s but an increased chance of merge errors. The feature operates similarly to a server-side git rebase.
34## critical bug in merging
36Successfully merged transactions did not have their constraints validated. Fixed.
38# 2017-06-12
40## add file locking
42This [feature](#102) allows Project:M36 database directories to be shared amongst multiple Project:M36 processes. This is similar to how SQLite operates except that the remote server mode supports the feature as well. This could allow, for example, multi-master, file-based replication across Windows shares or NFS.
44[Documentation](/docs/replication.markdown)
46# 2016-11-30
48## add functional dependency macro
50Date demonstrates two ways to implement functional dependencies as constraints on page 21 in "Database Design and Relational Theory". A similar macros is now implemented in the tutd interpreter.
52```funcdep sname_status (sname) -> (status) s```
54[Documentation](/docs/tutd_tutorial.markdown#functional-dependencies)
56# 2016-09-07
58## add TransGraphRelationalExpr
60The TransGraphRelationalExpr allows queries against all past states of the database.
62The following example executes a query against two different committed transactions using syntax similar to that of git for graph traversal:
63```:showtransgraphexpr s@master~ join sp@master```
65[Documentation](/docs/transgraphrelationalexpr.markdown)