anchor.diff:  
   -spec test_copy_value_to_snapshot_table(any()) -> ok.
   test_copy_value_to_snapshot_table(_Config) ->
  -    InitDb = ?TEST_DB:new(),
  -    Db = ?TEST_DB:init_snapshot(InitDb),
  +    InitDb = ?DB:new(),
  +    Db = ?DB:init_snapshot(InitDb),
       EntryFoo = db_entry:new(?KEY("foo"), ?VALUE("bar"), 0),
  -    Db = ?TEST_DB:set_entry(Db, EntryFoo),
  -    Db = ?TEST_DB:set_entry(Db, db_entry:new(?KEY("key"), ?VALUE("val"), 1)),
  -    Db = ?TEST_DB:set_entry(Db, db_entry:new(?KEY("123"), ?VALUE("456"), 0)),
  -    Db = ?TEST_DB:copy_value_to_snapshot_table(Db, ?KEY("foo")),
  -    ?equals(?TEST_DB:get_snapshot_entry(Db, ?KEY("key")), {false, db_entry:new(?KEY("key"))}),
  -    ?equals(?TEST_DB:get_snapshot_entry(Db, ?KEY("123")), {false, db_entry:new(?KEY("123"))}),
  -    ?equals(?TEST_DB:get_snapshot_entry(Db, ?KEY("bar")), {false, db_entry:new(?KEY("bar"))}),
  -    ?equals(?TEST_DB:get_snapshot_entry(Db, ?KEY("foo")), {true, EntryFoo}),
  +    Db = ?DB:set_entry(Db, EntryFoo),
  +    Db = ?DB:set_entry(Db, db_entry:new(?KEY("key"), ?VALUE("val"), 1)),
  +    Db = ?DB:set_entry(Db, db_entry:new(?KEY("123"), ?VALUE("456"), 0)),
  +    Db = ?DB:copy_value_to_snapshot_table(Db, ?KEY("foo")),
  +    ?equals(?DB:get_snapshot_entry(Db, ?KEY("key")), {false, db_entry:new(?KEY("key"))}),
  +    ?equals(?DB:get_snapshot_entry(Db, ?KEY("123")), {false, db_entry:new(?KEY("123"))}),
  +    ?equals(?DB:get_snapshot_entry(Db, ?KEY("bar")), {false, db_entry:new(?KEY("bar"))}),
  +    ?equals(?DB:get_snapshot_entry(Db, ?KEY("foo")), {true, EntryFoo}),
       ok.
   
   -spec test_set_get_for_snapshot_table(any()) -> ok.
   test_set_get_for_snapshot_table(_Config) ->
  -    InitDb = ?TEST_DB:new(),
  -    Db = ?TEST_DB:init_snapshot(InitDb),
  +    InitDb = ?DB:new(),
  +    Db = ?DB:init_snapshot(InitDb),
       EntryFoo = db_entry:new(?KEY("foo"), ?VALUE("bar"), 5),
  -    Db = ?TEST_DB:set_snapshot_entry(Db, EntryFoo),
  -    ?equals(?TEST_DB:get_snapshot_entry(Db, ?KEY("key")), {false, db_entry:new(?KEY("key"))}),
  -    ?equals(?TEST_DB:get_snapshot_entry(Db, ?KEY("foo")), {true, EntryFoo}),
  +    Db = ?DB:set_snapshot_entry(Db, EntryFoo),
  +    ?equals(?DB:get_snapshot_entry(Db, ?KEY("key")), {false, db_entry:new(?KEY("key"))}),
  +    ?equals(?DB:get_snapshot_entry(Db, ?KEY("foo")), {true, EntryFoo}),
       ok.
   
   -spec test_delete_from_snapshot_table(any()) -> ok.
   test_delete_from_snapshot_table(_Config) ->
  -    InitDb = ?TEST_DB:new(),
  -    Db = ?TEST_DB:init_snapshot(InitDb),
  +    InitDb = ?DB:new(),
  +    Db = ?DB:init_snapshot(InitDb),
       EntryFoo = db_entry:new(?KEY("foo"), ?VALUE("bar"), 5),
  -    Db = ?TEST_DB:set_snapshot_entry(Db, EntryFoo),
  -    ?equals(?TEST_DB:get_snapshot_entry(Db, ?KEY("foo")), {true, EntryFoo}),
  -    Db = ?TEST_DB:delete_snapshot_entry(Db, db_entry:new(?KEY("foo"), ?VALUE("some_val"), 4711)),
  -    ?equals(?TEST_DB:get_snapshot_entry(Db, ?KEY("foo")), {false, db_entry:new(?KEY("foo"))}),
  -    Db = ?TEST_DB:set_snapshot_entry(Db, EntryFoo),
  -    ?equals(?TEST_DB:get_snapshot_entry(Db, ?KEY("foo")), {true, EntryFoo}),
  -    Db = ?TEST_DB:delete_snapshot_entry_at_key(Db, ?KEY("foo")),
  -    ?equals(?TEST_DB:get_snapshot_entry(Db, ?KEY("foo")), {false, db_entry:new(?KEY("foo"))}),
  +    Db = ?DB:set_snapshot_entry(Db, EntryFoo),
  +    ?equals(?DB:get_snapshot_entry(Db, ?KEY("foo")), {true, EntryFoo}),
  +    Db = ?DB:delete_snapshot_entry(Db, db_entry:new(?KEY("foo"), ?VALUE("some_val"), 4711)),
  +    ?equals(?DB:get_snapshot_entry(Db, ?KEY("foo")), {false, db_entry:new(?KEY("foo"))}),
  +    Db = ?DB:set_snapshot_entry(Db, EntryFoo),
  +    ?equals(?DB:get_snapshot_entry(Db, ?KEY("foo")), {true, EntryFoo}),
  +    Db = ?DB:delete_snapshot_entry_at_key(Db, ?KEY("foo")),
  +    ?equals(?DB:get_snapshot_entry(Db, ?KEY("foo")), {false, db_entry:new(?KEY("foo"))}),
       ok.
   
   -spec test_init_snapshot(any()) -> ok.
   test_init_snapshot(_Config) ->
  -    InitDb = ?TEST_DB:new(),
  -    Db = ?TEST_DB:init_snapshot(InitDb),
  -    Db = ?TEST_DB:set_snapshot_entry(Db, db_entry:new(?KEY("foo"), ?VALUE("bar"), 5)),
  +    InitDb = ?DB:new(),
  +    Db = ?DB:init_snapshot(InitDb),
  +    Db = ?DB:set_snapshot_entry(Db, db_entry:new(?KEY("foo"), ?VALUE("bar"), 5)),
       EntryKey = db_entry:new(?KEY("key"), ?VALUE("val"), 4711),
  -    Db = ?TEST_DB:set_entry(Db, EntryKey),
  -    Db = ?TEST_DB:copy_value_to_snapshot_table(Db, ?KEY("key")),
  -    ClearDb = ?TEST_DB:init_snapshot(Db),
  -    ?equals(?TEST_DB:get_snapshot_entry(ClearDb, ?KEY("foo")), {false, db_entry:new(?KEY("foo"))}),
  -    ?equals(?TEST_DB:get_snapshot_entry(ClearDb, ?KEY("key")), {false, db_entry:new(?KEY("key"))}),
  -    ?equals(?TEST_DB:get_entry2(ClearDb, ?KEY("key")), {true, EntryKey}),
  -    ClearDb = ?TEST_DB:copy_value_to_snapshot_table(ClearDb, ?KEY("key")),
  -    ?equals(?TEST_DB:get_snapshot_entry(ClearDb, ?KEY("key")), {true, EntryKey}),
  +    Db = ?DB:set_entry(Db, EntryKey),
  +    Db = ?DB:copy_value_to_snapshot_table(Db, ?KEY("key")),
  +    ClearDb = ?DB:init_snapshot(Db),
  +    ?equals(?DB:get_snapshot_entry(ClearDb, ?KEY("foo")), {false, db_entry:new(?KEY("foo"))}),
  +    ?equals(?DB:get_snapshot_entry(ClearDb, ?KEY("key")), {false, db_entry:new(?KEY("key"))}),
  +    ?equals(?DB:get_entry2(ClearDb, ?KEY("key")), {true, EntryKey}),
  +    ClearDb = ?DB:copy_value_to_snapshot_table(ClearDb, ?KEY("key")),
  +    ?equals(?DB:get_snapshot_entry(ClearDb, ?KEY("key")), {true, EntryKey}),
       ok.
   
   -spec test_delete_snapshot(any()) -> ok.
   test_delete_snapshot(_) ->
  -    InitDb = ?TEST_DB:new(),
  -    Db = ?TEST_DB:init_snapshot(InitDb),
  -    Db = ?TEST_DB:set_snapshot_entry(Db, db_entry:new(?KEY("foo"), ?VALUE("bar"), 5)),
  -    DelDb = ?TEST_DB:delete_snapshot(Db),
  -    ?equals(?TEST_DB:snapshot_is_running(DelDb), false),
  +    InitDb = ?DB:new(),
  +    Db = ?DB:init_snapshot(InitDb),
  +    Db = ?DB:set_snapshot_entry(Db, db_entry:new(?KEY("foo"), ?VALUE("bar"), 5)),
  +    DelDb = ?DB:delete_snapshot(Db),
  +    ?equals(?DB:snapshot_is_running(DelDb), false),
       ok.
   
   %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  
positive.code: % -> "old" entries should be copied to the snapshot-db in copy-on-write fashion
  -spec test_rdht_tx_read_validate_db_copy(any()) -> ok.
  test_rdht_tx_read_validate_db_copy(_) ->
      Db = ?TEST_DB:init_snapshot(?TEST_DB:new()),
      EntryKey = db_entry:new(?KEY("key"), ?VALUE("val"), 1),
      Db = ?TEST_DB:set_entry(Db, EntryKey),
      TLogEntry = tx_tlog:new_entry(?read, ?KEY("key"), 2, ?ok, 1, ?value, ?VALUE("new_val")),
      {NewDb, _Vote} = rdht_tx_read:validate(Db, 1, TLogEntry),
      ?equals(?TEST_DB:get_snapshot_entry(NewDb, ?KEY("key")),
              {true, EntryKey}), % no readlocks in snap db
      ?equals(?TEST_DB:get_entry2(NewDb, ?KEY("key")),
              {true, db_entry:inc_readlock(EntryKey)}), % 1 readlock in live db
      ok.
  
  
negative.code: % snapshot number in entry equals local number -> prepared
  -spec test_rdht_tx_write_validate_should_prepare(any()) -> ok.
  test_rdht_tx_write_validate_should_prepare(_) ->
      Db = ?DB:init_snapshot(?DB:new()),
      Db = ?DB:set_entry(Db, db_entry:new(?KEY("key"), ?VALUE("val"), 1)),
      TLogEntry = tx_tlog:new_entry(?write, ?KEY("key"), 1, ?ok, 4711, ?value, ?VALUE("val")),
      {_NewDb, Vote} = rdht_tx_write:validate(Db, 4711, TLogEntry),
      ?equals(Vote, ?prepared),
  