Move sessions to db table instead of JWTs

Sources/stella/Models/Session.swift

@@ -0,0 +1,32 @@
+import Fluent
+
+final class Session: Model, @unchecked Sendable {
+    static let schema: String = "sessions"
+
+    @ID(custom: "token", generatedBy: .random)
+    var id: String?
+
+    @Parent(key: "accountId")
+    var account: Account
+
+    @Field(key: "expires")
+    var expires: Date
+
+    @Field(key: "type")
+    var type: SessionType
+
+    init() { }
+
+    init(account: Account, expires: Date, type: SessionType) throws {
+        self.id = UUID().uuidString
+        self.$account.id = try account.requireID()
+        self.expires = expires
+        self.type = type
+    }
+}
+
+enum SessionType: Int, Codable {
+    case ZAT = 0
+    case ZRT = 1
+    case VIEWER = 2
+}