Add relationships feature and EF migration

src/RecNet.Infrastructure/Persistence/Repositories/RelationshipRepository.cs

@@ -0,0 +1,31 @@
+using Microsoft.EntityFrameworkCore;
+using RecNet.Domain.Profiles;
+
+namespace RecNet.Infrastructure.Persistence.Repositories;
+
+public class RelationshipRepository(DatabaseContext dbContext) : IRelationshipRepository
+{
+    public Task<Relationship?> GetAsync(
+        Guid ownerId, 
+        Guid profileId, 
+        CancellationToken ct = default)
+        => dbContext.Relationships
+            .FirstOrDefaultAsync(x => 
+                x.OwnerProfileId == ownerId && 
+                x.ProfileId == profileId, 
+                ct);
+
+    public async Task<IReadOnlyList<Relationship>> GetAllOwnedRelationships(Guid ownerId, CancellationToken ct = default)
+        => await dbContext.Relationships
+            .AsNoTracking()
+            .Where(x => x.OwnerProfileId == ownerId)
+            .ToListAsync(ct);
+
+    public async Task AddAsync(
+        Relationship relationship, 
+        CancellationToken ct = default)
+        => await dbContext.Relationships.AddAsync(relationship, ct);
+
+    public Task SaveChangesAsync(CancellationToken ct = default)
+        => dbContext.SaveChangesAsync(ct);
+}