Many changes in DBHandler

new general processing structure
just before splitting off the projects folder from this repo

Classes/DataBaseHandler/Equalizerstruct.m

@@ -0,0 +1,68 @@
+classdef Equalizerstruct
+    % Equalizerstruct - Class to store and manage equalizer structure data
+    
+    properties
+        eq_id (1,1) double {mustBeNumeric} = NaN
+        equalizer_structure equalizer_structure = equalizer_structure.ffe
+        eq 
+        mlse 
+        comment char = string.empty()      % Changed to string with proper empty initialization
+        hash char = string.empty()         % Changed to string with proper empty initialization
+    end
+    
+    methods
+        function obj = Equalizerstruct(varargin)
+            % Constructor method for Equalizerstruct
+            % Can be called empty or with name-value pairs
+            
+            if nargin > 0
+                for i = 1:2:nargin
+                    if isprop(obj, varargin{i})
+                        obj.(varargin{i}) = varargin{i+1};
+                    else
+                        error('Property %s does not exist in Equalizerstruct', varargin{i});
+                    end
+                end
+            end
+        end
+        
+        function s = toStruct(obj)
+            % Convert the object to a struct
+            s = struct();
+            props = properties(obj);
+            for i = 1:length(props)
+                s.(props{i}) = obj.(props{i});
+            end
+        end
+        
+        function str = toString(obj)
+            % Convert the object to a formatted string
+            s = obj.toStruct();
+            str = sprintf('Equalizerstruct:\n');
+            fields = fieldnames(s);
+            for i = 1:length(fields)
+                val = s.(fields{i});
+                if isempty(val)
+                    str = sprintf('%s%s: []\n', str, fields{i});
+                elseif isnumeric(val) && length(val) > 1
+                    str = sprintf('%s%s: [%s]\n', str, fields{i}, num2str(val'));
+                else
+                    str = sprintf('%s%s: %s\n', str, fields{i}, string(val));
+                end
+            end
+        end
+    end
+    
+    methods (Static)
+        function obj = fromStruct(s)
+            % Create an Equalizerstruct object from a struct
+            obj = Equalizerstruct();
+            fields = fieldnames(s);
+            for i = 1:length(fields)
+                if isprop(obj, fields{i})
+                    obj.(fields{i}) = s.(fields{i});
+                end
+            end
+        end
+    end
+end