fixes for new polling setup

update database model for alias (nullable ip)
heartbeats now send ip to master server

SharedLibraryCore/Migrations/20181125193243_MakeClientIPNullable.cs

@@ -0,0 +1,85 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace SharedLibraryCore.Migrations
+{
+    public partial class MakeClientIPNullable : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            if (migrationBuilder.ActiveProvider == "Microsoft.EntityFrameworkCore.Sqlite")
+            {
+                migrationBuilder.Sql(@"PRAGMA foreign_keys = 0;
+
+CREATE TABLE sqlitestudio_temp_table AS SELECT *
+                                          FROM EFAlias;
+
+DROP TABLE EFAlias;
+
+CREATE TABLE EFAlias (
+    AliasId   INTEGER NOT NULL
+                      CONSTRAINT PK_EFAlias PRIMARY KEY AUTOINCREMENT,
+    Active    INTEGER NOT NULL,
+    DateAdded TEXT    NOT NULL,
+    IPAddress INTEGER,
+    LinkId    INTEGER NOT NULL,
+    Name      TEXT    NOT NULL,
+    CONSTRAINT FK_EFAlias_EFAliasLinks_LinkId FOREIGN KEY (
+        LinkId
+    )
+    REFERENCES EFAliasLinks (AliasLinkId) ON DELETE RESTRICT
+);
+
+INSERT INTO EFAlias (
+                        AliasId,
+                        Active,
+                        DateAdded,
+                        IPAddress,
+                        LinkId,
+                        Name
+                    )
+                    SELECT AliasId,
+                           Active,
+                           DateAdded,
+                           IPAddress,
+                           LinkId,
+                           Name
+                      FROM sqlitestudio_temp_table;
+
+DROP TABLE sqlitestudio_temp_table;
+
+CREATE INDEX IX_EFAlias_LinkId ON EFAlias (
+    ""LinkId""
+);
+
+                CREATE INDEX IX_EFAlias_IPAddress ON EFAlias(
+                    ""IPAddress""
+                );
+
+                CREATE INDEX IX_EFAlias_Name ON EFAlias(
+                    ""Name""
+                );
+
+                PRAGMA foreign_keys = 1;
+                ");
+            }
+            else
+            {
+                migrationBuilder.AlterColumn<int>(
+                    name: "IPAddress",
+                    table: "EFAlias",
+                    nullable: true,
+                    oldClrType: typeof(int));
+            }
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AlterColumn<int>(
+                name: "IPAddress",
+                table: "EFAlias",
+                nullable: false,
+                oldClrType: typeof(int),
+                oldNullable: true);
+        }
+    }
+}