Re-added the incoming JSON format

internal/entity/JSONQuery.go

+package entity
+
+// IncomingQueryJSON describes the query coming into the service in JSON format
+type IncomingQueryJSON struct {
+	DatabaseName string
+	Return       QueryReturnStruct
+	Entities     []QueryEntityStruct
+	Relations    []QueryRelationStruct
+	// Limit is for limiting the amount of paths AQL will return in a relation let statement
+	Limit     int
+	Modifiers []QueryModifierStruct
+}
+
+// QueryReturnStruct holds the indices of the entities and relations that need to be returned
+type QueryReturnStruct struct {
+	Entities  []int
+	Relations []int
+	//Modifiers []int
+}
+
+// QueryEntityStruct encapsulates a single entity with its corresponding constraints
+type QueryEntityStruct struct {
+	Type        string
+	Constraints []QueryConstraintStruct
+}
+
+// QueryRelationStruct encapsulates a single relation with its corresponding constraints
+type QueryRelationStruct struct {
+	Type        string
+	EntityFrom  int
+	EntityTo    int
+	Depth       QuerySearchDepthStruct
+	Constraints []QueryConstraintStruct
+}
+
+// QueryModifierStruct encapsulates a single modifier with its corresponding constraints
+type QueryModifierStruct struct {
+	Type           string // SUM COUNT AVG
+	SelectedType   string // node relation
+	ID             int    // ID of the enitity or relation
+	AttributeIndex int    // = -1 if its the node or relation, = > -1 if an attribute is selected
+}
+
+// QuerySearchDepthStruct holds the range of traversals for the relation
+type QuerySearchDepthStruct struct {
+	Min int
+	Max int
+}
+
+// QueryConstraintStruct holds the information of the constraint
+// Constraint datatypes
+// 	text     MatchTypes: exact/contains/startswith/endswith
+// 	number   MatchTypes: GT/LT/EQ
+// 	bool     MatchTypes: EQ/NEQ
+type QueryConstraintStruct struct {
+	Attribute string
+	Value     string
+	DataType  string
+	MatchType string
+}