Add username parameter to endpoints for finding valid names.
Add endpoint for names history with search capabilities.
Refactor and clarify concept of lines of uuid.

Purpose to increase readability and reduce complexity.

Fix issues in validation.
Add integration tests for multiple name elements - create, update, delete.
Add integration tests for multiple structure elements - create, update, delete, approve, cancel, reject.

Application will generate uuid.
Update validation to not allow value for uuid when create names and structures.
Update integration tests.

Assignments should not be redundant
Collection sizes and array length comparisons should make sense
Conditionally executed code should be reachable
Empty arrays and collections should be returned instead of null
Local variables should not shadow class fields
Null pointers should not be dereferenced
Pattern Matching for "instanceof" operator should be used instead of simple "instanceof" + cast
Return of boolean expressions should not be wrapped into an "if-then-else" statement
Sections of code should not be commented out
"switch" statements should have at least 3 "case" clauses
Two branches in a conditional structure should not have exactly the same implementation

Declarations should use Java collection interfaces such as "List" rather than specific implementation classes such as "LinkedList"
Empty statements should be removed
JUnit assertTrue/assertFalse should be simplified to the corresponding dedicated assertion
JUnit5 test classes and methods should have default package visibility
Methods and field names should not be the same or differ only by capitalization
Nested "enum"s should not be declared static

Update REST API with response codes for endpoints.
Set http status codes corresponding to exceptions.

Handle exceptions in service and controller layers.
Translate exceptions to http status codes in global exception handler.

Rename package for beans.
Remove unused beans.

Update and add tests-

Change mnemonic path for structure elements to
system group, system, system + subsystem

Change name element to refer to parentsystemstructure and parentdevicestructure (uuid)
instead of system group, system, subsystem, device type (uuid).
For system structure, change 3 fields to 1 field (system group, system, subsystem to parent system structure).
For device structure, change 1 field  to 1 field (device type to parent device structure).

Allow one pending entry for uuid, mnemonic, mnemonic equivalence.
Update validation to consider status together with mnemonic, mnemonic validation.
Multiple pending entries per uuid no longer allowed.

Update docker integration tests accordingly.

Updated validation of instance index rules for names and added docker integration tests for REST API endpoints for names

Updated validation of mnemonic rules for structures and added docker integration tests for REST API endpoints for structures