Separate UIDs and Revisions in main databases

Summary:
- Change revision type from `qint64` to `size_t` for LMDB in a couple of places (LMDB supports `unsigned int` or `size_t` which are `long unsigned int` on my machine)
- Better support for database flags (duplicate, integer keys, integer values for now but is extensible)
- Main databases' keys are now revisions
- Some databases switched to integer keys databases:
  - Main databases
  - the revision to uid mapping database
  - the revision to entity type mapping database
- Refactor the entity type's `typeDatabases` method (if in the future we need to change the main databases' flags again)
- New uid to revision mapping database (`uidsToRevisions`):
  - Stores all revisions (not uid to latest revision) because we need it for cleaning old revisions
  - Flags are: duplicates + integer values (so findLatest finds the latest revision for the given uid)

~~Problems to fix before merging:~~
All Fixed!

- ~~Sometimes Sink can't read what has just been written to the database (maybe because of transactions race conditions)~~
  - ~~Most of the times, this results in Sink not able to find the uid for a given revision by reading the `revisions` database~~
- ~~`pipelinetest`'s `testModifyWithConflict` fails because the local changes are overridden~~

~~The first problem prevents me from running benchmarks~~

Reviewers: cmollekopf

Tags: #sink

Differential Revision: https://phabricator.kde.org/D14974

1 files changed, 6 insertions, 6 deletions

diff --git a/tests/dbwriter.cpp b/tests/dbwriter.cpp
index 3045eac..a25faec 100644
--- a/tests/dbwriter.cpp
+++ b/tests/dbwriter.cpp
@@ -29,14 +29,14 @@ int main(int argc, char *argv[])
             qWarning() << "No valid transaction";
             return -1;
         }
-        transaction.openDatabase("a", nullptr, false).write(QByteArray::number(i), "a");
-        transaction.openDatabase("b", nullptr, false).write(QByteArray::number(i), "b");
-        transaction.openDatabase("c", nullptr, false).write(QByteArray::number(i), "c");
-        transaction.openDatabase("p", nullptr, false).write(QByteArray::number(i), "c");
-        transaction.openDatabase("q", nullptr, false).write(QByteArray::number(i), "c");
+        transaction.openDatabase("a", nullptr, 0).write(QByteArray::number(i), "a");
+        transaction.openDatabase("b", nullptr, 0).write(QByteArray::number(i), "b");
+        transaction.openDatabase("c", nullptr, 0).write(QByteArray::number(i), "c");
+        transaction.openDatabase("p", nullptr, 0).write(QByteArray::number(i), "c");
+        transaction.openDatabase("q", nullptr, 0).write(QByteArray::number(i), "c");
         if (i > (count/2)) {
             for (int d = 0; d < 40; d++) {
-                transaction.openDatabase("db" + QByteArray::number(d), nullptr, false).write(QByteArray::number(i), "a");
+                transaction.openDatabase("db" + QByteArray::number(d), nullptr, 0).write(QByteArray::number(i), "a");
             }
         }
         if ((i % 1000) == 0) {