feat(CUB-56): Agent State Database Migration

backend/Configurations/AgentConfiguration.cs

@@ -0,0 +1,88 @@
+using ControlCenter.Api.Entities;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace ControlCenter.Api.Configurations;
+
+/// <summary>
+/// EF Core entity type configuration for the agents table.
+/// Enforces snake_case naming, required fields, and index design.
+/// </summary>
+public class AgentConfiguration : IEntityTypeConfiguration<Agent>
+{
+    public void Configure(EntityTypeBuilder<Agent> builder)
+    {
+        // Table name — snake_case
+        builder.ToTable("agents");
+
+        // Primary key
+        builder.HasKey(a => a.Id);
+        builder.Property(a => a.Id)
+            .HasColumnName("id")
+            .ValueGeneratedOnAdd();
+
+        // Status — stored as PostgreSQL enum via Npgsql
+        builder.Property(a => a.Status)
+            .HasColumnName("status")
+            .HasColumnType("agent_status")
+            .IsRequired();
+
+        // Task — nullable text
+        builder.Property(a => a.Task)
+            .HasColumnName("task")
+            .HasColumnType("text");
+
+        // Progress — nullable integer (0–100)
+        builder.Property(a => a.Progress)
+            .HasColumnName("progress");
+
+        // Session key — required, not null
+        builder.Property(a => a.SessionKey)
+            .HasColumnName("session_key")
+            .HasColumnType("text")
+            .IsRequired();
+
+        // Channel — required, not null
+        builder.Property(a => a.Channel)
+            .HasColumnName("channel")
+            .HasColumnType("text")
+            .IsRequired();
+
+        // Last activity — required, defaults to now()
+        builder.Property(a => a.LastActivity)
+            .HasColumnName("last_activity")
+            .HasColumnType("timestamptz")
+            .IsRequired();
+
+        // Created at — auto-set on insert
+        builder.Property(a => a.CreatedAt)
+            .HasColumnName("created_at")
+            .HasColumnType("timestamptz")
+            .IsRequired()
+            .HasDefaultValueSql("now()");
+
+        // Updated at — auto-set on insert and update
+        builder.Property(a => a.UpdatedAt)
+            .HasColumnName("updated_at")
+            .HasColumnType("timestamptz")
+            .IsRequired()
+            .HasDefaultValueSql("now()");
+
+        // Indexes
+        // Sessions are looked up by session_key frequently
+        builder.HasIndex(a => a.SessionKey)
+            .HasDatabaseName("ix_agents_session_key")
+            .IsUnique();
+
+        // Agents are filtered by channel for channel-specific queries
+        builder.HasIndex(a => a.Channel)
+            .HasDatabaseName("ix_agents_channel");
+
+        // Agents are filtered by status for fleet health monitoring
+        builder.HasIndex(a => a.Status)
+            .HasDatabaseName("ix_agents_status");
+
+        // Check constraint: progress must be 0–100 if present
+        builder.ToTable(t => t.HasCheckConstraint("ck_agents_progress_range", "progress IS NULL OR (progress >= 0 AND progress <= 100)"));
+    }
+}