first things

Datamodels/BusinessModels/ResultModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Datamodels.BusinessModels
+{
+    public enum GeneralResults
+    {
+        Success = 0,
+        DatabaseError = 1,
+        GeneralError = 2, 
+        LogicWarning = 3,
+        Created = 4,
+        Updated = 5,
+        Deleted = 6
+    }
+
+    public class ResultObject
+    {
+        public GeneralResults GeneralResult { get; set; } = GeneralResults.Success;
+        public string UserMessage { get; set; }
+        public string ServerMessage { get; set; }
+        public string StackTrace { get; set; }
+    }
+
+    public class DataResult<T> : ResultObject
+    {
+        public T Data { get; set; }
+        public long TotalCount { get; set; }
+        public long Skip { get; set; }
+        public long Take { get; set; }
+        public TimeSpan Duration { get; set; }
+    }
+}

Datamodels/BusinessModels/SortModel.cs

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+namespace Datamodels.BusinessModels
+{
+
+    public enum SortDirections
+    {
+        Ascending,
+        Descending
+    }
+
+    public sealed class SortModel
+    {
+        public int SortFieldOrder { get; set; }
+        public string SortFieldName { get; set; }
+        public SortDirections SortDirection { get; set; } = SortDirections.Ascending;
+
+    }
+}

Datamodels/DatabaseModels/Address.cs

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+using System;
+using Datamodels.Lookups;
+
+namespace Datamodels.DatabaseModels
+{
+    public class Address: IEntityClass
+    {
+        public long Id { get; set; }
+        public string StreetName { get; set; }
+        public int StreetNumber { get; set; }
+        public string Zip { get; set; }
+        public string City { get; set; }
+        public DateTime CreatedAt { get; set; }
+        public DateTime ChangedAt { get; set; }
+        public LookupValue AddressType { get; set; } //something like "Job" or "Private"
+        public Person Person { get; set; }
+    }
+}

Datamodels/DatabaseModels/Communication.cs

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+using System;
+using Datamodels.Lookups;
+
+namespace Datamodels.DatabaseModels
+{
+    public class Communication
+    {
+        public long Id { get; set; }
+        public string CommunicationValue { get; set; } //mobile phone, home phone, job mail, etc.
+        public LookupValue CommunicationType { get; set; }
+        public DateTime CreatedAt { get; set; }
+        public DateTime ChangedAt { get; set; }
+        public Person Person { get; set; }
+    }
+}

Datamodels/DatabaseModels/IEntityClass.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Datamodels.DatabaseModels
+{
+    public interface IEntityClass
+    {
+    }
+}

Datamodels/DatabaseModels/Person.cs

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+using System;
+using System.Collections.Generic;
+using Datamodels.Lookups;
+
+namespace Datamodels.DatabaseModels
+{
+    public class Person
+    {
+        public long Id { get; set; }
+        public string LastName { get; set; }
+        public string FirstName { get; set; }
+        public DateTime? Birthday { get; set; }
+        public bool IsActive { get; set; }
+        public DateTime CreatedAt { get; set; }
+        public DateTime ChangedAt { get; set; }
+        public LookupValue Gender { get; set; }
+        public List<Address> Addresses { get; set; }
+        public List<Communication> Communications { get; set; }
+    }
+}

Datamodels/Datamodels.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.1</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
+  </ItemGroup>
+
+</Project>

Datamodels/Enums/FieldTypes.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Datamodels.Enums
+{
+    public enum FieldTypes
+    {
+        String,
+        Integer,
+        Double,
+        Boolean,
+        DateTime,
+        Currency,
+        Blob
+    }
+}

Datamodels/Enums/JoinTypes.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Datamodels.Enums
+{
+    public enum JoinTypes
+    {
+        And,
+        Or
+    }
+}

Datamodels/Enums/PhraseOperators.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Datamodels.Enums
+{
+    public enum PhraseOperators
+    {
+        Equal,
+        NotEqual,
+        LowerThan,
+        LowerThanOrEqual,
+        GreaterThan,
+        GreaterThanOrEqual,
+        StartsWith,
+        Contains,
+        EndsWith
+    }
+}

Datamodels/Enums/SearchTypes.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Datamodels.Enums
+{
+    public enum SearchTypes
+    {
+        Phrase,
+        Range,
+        Terms
+    }
+}

Datamodels/Lookups/LookupCategory.cs

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+using System.Collections.Generic;
+
+namespace Datamodels.Lookups
+{
+    public sealed class LookupCategory
+    {
+        public long Id { get; set; }
+        public string CategoryName { get; set; }
+        public bool IsActive { get; set; } = true;
+        public List<LookupValue> LookupValues { get; set; }
+    }
+}

Datamodels/Lookups/LookupValue.cs

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+using Newtonsoft.Json;
+
+namespace Datamodels.Lookups
+{
+    public sealed class LookupValue {
+        
+        public long Id { get; set; }
+        public string Value { get; set; }
+        public bool IsActive { get; set; } = true;
+        [JsonIgnore]
+        public LookupCategory LookupCategory { get; set; }
+
+    }
+}

Datamodels/SearchModels/FieldModel.cs

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+using Datamodels.Enums;
+using System;
+using System.Collections.Generic;
+
+namespace Datamodels.SearchModels
+{
+
+    public sealed class FieldModel
+    {
+        public string FieldName { get; set; }
+        public string FieldAlias { get; set; }
+        public FieldTypes FieldType { get; set; }
+        public List<SearchDescription> SearchDescriptions { get; set; }
+    }
+}

Datamodels/SearchModels/FilterModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Datamodels.SearchModels
+{
+    public class FilterModel
+    {
+        public List<TableModel> TableDescriptions { get; set; }
+        public long Skip { get; set; }
+        public long Take { get; set; }
+    }
+}

Datamodels/SearchModels/ResultDataModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Datamodels.SearchModels
+{
+    public class ResultDataModel
+    {
+        public List<ResultRowModel> ResultRows { get; set; }
+    }
+}

Datamodels/SearchModels/ResultFieldModel.cs

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+using Datamodels.Enums;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Datamodels.SearchModels
+{
+    /// <summary>
+    /// Field base query Result
+    /// </summary>
+    public class ResultFieldModel
+    {
+        public FieldTypes FieldType { get; set; }
+        public string FieldContent { get; set; }
+        public int FieldContentInt { get; set; }
+        public DateTime FieldContentDate { get; set; }
+        public Decimal FieldContentDecimal { get; set; } 
+        public float FieldContentFloat { get; set; }
+        public string FieldContentString { get; set; }
+    }
+}

Datamodels/SearchModels/ResultModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Datamodels.SearchModels
+{
+    public class ResultModel
+    {
+        public FilterModel SearchModel { get; set; }
+        public ResultDataModel ResultData { get; set; }
+
+    }
+}

Datamodels/SearchModels/ResultRowModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Datamodels.SearchModels
+{
+    public class ResultRowModel
+    {
+        public List<ResultFieldModel> RowFields { get; set; }
+    }
+}

Datamodels/SearchModels/SearchDescription.cs

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+using Datamodels.Enums;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Datamodels.SearchModels
+{
+    
+    public class SearchDescription
+    {
+        public SearchObject SearchData { get; set; }
+        public JoinTypes JoinType { get; set; }
+        
+    }
+}

Datamodels/SearchModels/SearchObject.cs

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+using Datamodels.Enums;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Datamodels.SearchModels
+{
+
+    public class SearchObject
+    {
+        public List<string> Values { get; set; }
+        public SearchTypes SearchType { get; set; }
+        public PhraseOperators PhraseOperator { get; set; }
+
+
+    }
+}

Datamodels/SearchModels/TableModel.cs

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+using System;
+using System.Collections.Generic;
+
+namespace Datamodels.SearchModels
+{
+    public sealed class TableModel
+    {
+        public string TableName { get; set; }
+        public string TableAlias { get; set; }
+        public List<FieldModel> Fields { get; set; } = new List<FieldModel>();
+    }
+}