refactor: simplify data connections from many-to-many site assignment to direct site ownership
Replace SiteDataConnectionAssignment join table with a direct SiteId FK on DataConnection, simplifying the data model, repositories, UI, CLI, and deployment service.
This commit is contained in:
Joseph Doherty
1227
src/ScadaLink.ConfigurationDatabase/Migrations/20260321210402_AddSiteIdToDataConnections.Designer.cs
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1227
src/ScadaLink.ConfigurationDatabase/Migrations/20260321210402_AddSiteIdToDataConnections.Designer.cs
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using Microsoft.EntityFrameworkCore.Migrations;
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#nullable disable
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namespace ScadaLink.ConfigurationDatabase.Migrations
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{
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/// <inheritdoc />
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public partial class AddSiteIdToDataConnections : Migration
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{
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/// <inheritdoc />
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protected override void Up(MigrationBuilder migrationBuilder)
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{
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// Step 1: Drop old unique index on Name (allows duplicate names across sites)
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migrationBuilder.DropIndex(
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name: "IX_DataConnections_Name",
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table: "DataConnections");
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// Step 2: Add nullable SiteId column
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migrationBuilder.AddColumn<int>(
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name: "SiteId",
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table: "DataConnections",
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type: "int",
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nullable: true);
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// Step 3: Migrate data from SiteDataConnectionAssignments
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migrationBuilder.Sql(@"
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-- Phase A: Assign the first site to each existing DataConnection
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UPDATE dc
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SET dc.SiteId = a.SiteId
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FROM DataConnections dc
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INNER JOIN (
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SELECT DataConnectionId, MIN(SiteId) AS SiteId
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FROM SiteDataConnectionAssignments
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GROUP BY DataConnectionId
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) a ON dc.Id = a.DataConnectionId
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WHERE dc.SiteId IS NULL;
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-- Phase B: For connections assigned to additional sites, create copies
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-- and update InstanceConnectionBindings to point to the new copy
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DECLARE @AssignSiteId INT, @AssignConnId INT, @NewConnId INT;
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DECLARE @OrigName NVARCHAR(200), @OrigProtocol NVARCHAR(50), @OrigConfig NVARCHAR(4000);
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DECLARE assignment_cursor CURSOR FOR
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SELECT a.SiteId, a.DataConnectionId
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FROM SiteDataConnectionAssignments a
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INNER JOIN DataConnections dc ON a.DataConnectionId = dc.Id
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WHERE dc.SiteId <> a.SiteId;
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OPEN assignment_cursor;
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FETCH NEXT FROM assignment_cursor INTO @AssignSiteId, @AssignConnId;
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WHILE @@FETCH_STATUS = 0
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BEGIN
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SELECT @OrigName = Name, @OrigProtocol = Protocol, @OrigConfig = Configuration
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FROM DataConnections WHERE Id = @AssignConnId;
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INSERT INTO DataConnections (SiteId, Name, Protocol, Configuration)
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VALUES (@AssignSiteId, @OrigName, @OrigProtocol, @OrigConfig);
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SET @NewConnId = SCOPE_IDENTITY();
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-- Update bindings for instances on this site to point to the new connection
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UPDATE icb
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SET icb.DataConnectionId = @NewConnId
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FROM InstanceConnectionBindings icb
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INNER JOIN Instances i ON icb.InstanceId = i.Id
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WHERE icb.DataConnectionId = @AssignConnId
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AND i.SiteId = @AssignSiteId;
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FETCH NEXT FROM assignment_cursor INTO @AssignSiteId, @AssignConnId;
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END
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CLOSE assignment_cursor;
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DEALLOCATE assignment_cursor;
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-- Phase C: Handle any DataConnections not assigned to any site
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-- (assign to the first site as a fallback)
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UPDATE dc
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SET dc.SiteId = (SELECT TOP 1 Id FROM Sites ORDER BY Id)
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FROM DataConnections dc
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WHERE dc.SiteId IS NULL;
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");
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// Step 4: Make SiteId non-nullable
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migrationBuilder.AlterColumn<int>(
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name: "SiteId",
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table: "DataConnections",
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type: "int",
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nullable: false,
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defaultValue: 0,
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oldClrType: typeof(int),
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oldType: "int",
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oldNullable: true);
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// Step 5: Add composite unique index and FK
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migrationBuilder.CreateIndex(
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name: "IX_DataConnections_SiteId_Name",
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table: "DataConnections",
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columns: new[] { "SiteId", "Name" },
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unique: true);
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migrationBuilder.AddForeignKey(
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name: "FK_DataConnections_Sites_SiteId",
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table: "DataConnections",
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column: "SiteId",
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principalTable: "Sites",
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principalColumn: "Id",
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onDelete: ReferentialAction.Restrict);
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// Step 6: Drop SiteDataConnectionAssignments table
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migrationBuilder.DropTable(
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name: "SiteDataConnectionAssignments");
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}
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/// <inheritdoc />
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protected override void Down(MigrationBuilder migrationBuilder)
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{
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// Recreate SiteDataConnectionAssignments table
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migrationBuilder.CreateTable(
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name: "SiteDataConnectionAssignments",
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columns: table => new
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{
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Id = table.Column<int>(type: "int", nullable: false)
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.Annotation("SqlServer:Identity", "1, 1"),
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DataConnectionId = table.Column<int>(type: "int", nullable: false),
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SiteId = table.Column<int>(type: "int", nullable: false)
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},
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constraints: table =>
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{
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table.PrimaryKey("PK_SiteDataConnectionAssignments", x => x.Id);
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table.ForeignKey(
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name: "FK_SiteDataConnectionAssignments_DataConnections_DataConnectionId",
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column: x => x.DataConnectionId,
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principalTable: "DataConnections",
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principalColumn: "Id",
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onDelete: ReferentialAction.Cascade);
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table.ForeignKey(
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name: "FK_SiteDataConnectionAssignments_Sites_SiteId",
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column: x => x.SiteId,
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principalTable: "Sites",
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principalColumn: "Id",
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onDelete: ReferentialAction.Cascade);
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});
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migrationBuilder.CreateIndex(
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name: "IX_SiteDataConnectionAssignments_DataConnectionId",
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table: "SiteDataConnectionAssignments",
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column: "DataConnectionId");
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migrationBuilder.CreateIndex(
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name: "IX_SiteDataConnectionAssignments_SiteId_DataConnectionId",
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table: "SiteDataConnectionAssignments",
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columns: new[] { "SiteId", "DataConnectionId" },
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unique: true);
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// Migrate data back
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migrationBuilder.Sql(@"
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INSERT INTO SiteDataConnectionAssignments (SiteId, DataConnectionId)
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SELECT SiteId, Id FROM DataConnections;
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");
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// Remove FK and composite index
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migrationBuilder.DropForeignKey(
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name: "FK_DataConnections_Sites_SiteId",
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table: "DataConnections");
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migrationBuilder.DropIndex(
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name: "IX_DataConnections_SiteId_Name",
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table: "DataConnections");
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// Restore unique index on Name
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migrationBuilder.CreateIndex(
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name: "IX_DataConnections_Name",
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table: "DataConnections",
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column: "Name",
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unique: true);
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// Drop SiteId column
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migrationBuilder.DropColumn(
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name: "SiteId",
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table: "DataConnections");
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}
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}
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}
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@@ -766,9 +766,12 @@ namespace ScadaLink.ConfigurationDatabase.Migrations
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.HasMaxLength(50)
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.HasColumnType("nvarchar(50)");
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b.Property<int>("SiteId")
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.HasColumnType("int");
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b.HasKey("Id");
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b.HasIndex("Name")
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b.HasIndex("SiteId", "Name")
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.IsUnique();
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b.ToTable("DataConnections");
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@@ -821,30 +824,6 @@ namespace ScadaLink.ConfigurationDatabase.Migrations
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b.ToTable("Sites");
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});
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modelBuilder.Entity("ScadaLink.Commons.Entities.Sites.SiteDataConnectionAssignment", b =>
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{
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b.Property<int>("Id")
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.ValueGeneratedOnAdd()
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.HasColumnType("int");
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SqlServerPropertyBuilderExtensions.UseIdentityColumn(b.Property<int>("Id"));
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b.Property<int>("DataConnectionId")
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.HasColumnType("int");
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b.Property<int>("SiteId")
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.HasColumnType("int");
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b.HasKey("Id");
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b.HasIndex("DataConnectionId");
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b.HasIndex("SiteId", "DataConnectionId")
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.IsUnique();
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b.ToTable("SiteDataConnectionAssignments");
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});
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modelBuilder.Entity("ScadaLink.Commons.Entities.Templates.Template", b =>
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{
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b.Property<int>("Id")
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@@ -1153,18 +1132,12 @@ namespace ScadaLink.ConfigurationDatabase.Migrations
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.IsRequired();
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});
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modelBuilder.Entity("ScadaLink.Commons.Entities.Sites.SiteDataConnectionAssignment", b =>
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modelBuilder.Entity("ScadaLink.Commons.Entities.Sites.DataConnection", b =>
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{
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b.HasOne("ScadaLink.Commons.Entities.Sites.DataConnection", null)
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.WithMany()
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.HasForeignKey("DataConnectionId")
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.OnDelete(DeleteBehavior.Cascade)
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.IsRequired();
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b.HasOne("ScadaLink.Commons.Entities.Sites.Site", null)
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.WithMany()
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.HasForeignKey("SiteId")
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.OnDelete(DeleteBehavior.Cascade)
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.OnDelete(DeleteBehavior.Restrict)
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.IsRequired();
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});
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