feat: Begins breaking database out into it's own module, using dependencies

Sources/DatabaseClient/VendorBranches.swift

@@ -0,0 +1,48 @@
+import Dependencies
+import DependenciesMacros
+import SharedModels
+
+public extension DatabaseClient {
+  @DependencyClient
+  struct VendorBranches: Sendable {
+    public var create: @Sendable (VendorBranch.Create) async throws -> VendorBranch
+    public var delete: @Sendable (VendorBranch.ID) async throws -> Void
+    public var fetchAll: @Sendable (FetchRequest) async throws -> [VendorBranch]
+    public var get: @Sendable (VendorBranch.ID) async throws -> VendorBranch?
+    public var update: @Sendable (VendorBranch.ID, VendorBranch.Update) async throws -> VendorBranch
+
+    public enum FetchRequest: Equatable {
+      case all
+      case `for`(vendorID: Vendor.ID)
+      case withVendor
+    }
+
+    public func fetchAll() async throws -> [VendorBranch] {
+      try await fetchAll(.all)
+    }
+  }
+}
+
+extension DatabaseClient.VendorBranches: TestDependencyKey {
+  public static let testValue: DatabaseClient.VendorBranches = Self()
+}
+
+public extension VendorBranch {
+  struct Create: Codable, Sendable {
+    public let name: String
+    public let vendorID: Vendor.ID
+
+    public init(name: String, vendorID: Vendor.ID) {
+      self.name = name
+      self.vendorID = vendorID
+    }
+  }
+
+  struct Update: Codable, Sendable {
+    public let name: String?
+
+    public init(name: String?) {
+      self.name = name
+    }
+  }
+}