feat(ui+backend): base of data persistence

internal/graph/query.graphql

@@ -8,6 +8,60 @@ type User {
   createdAt: Time!
 }
 
+type Project {
+  id: ID!
+  title: String!
+  tasks: [Task]!
+  params: ProjectParams!
+  acl: [Access]!
+  taskCategories: [TaskCategory]!
+}
+
+type Task {
+  id: ID!
+  label: String
+  category: TaskCategory
+  estimations: Estimations
+}
+
+type TaskCategory {
+  id: ID!
+  label: String!
+	costPerTimeUnit: Float!
+}
+
+type Access {
+  id: ID!
+  user: User!
+  level: String!
+}
+
+type ProjectParams {
+  timeUnit: TimeUnit
+  currency: String!
+  roundUpEstimations: Boolean!
+  hideFinancialPreviewOnPrint: Boolean!
+}
+
+type TimeUnit {
+  label: String!
+  acronym: String!
+}
+
+type Estimations {
+  optimistic: Float!
+  likely: Float!
+  pessimistic: Float!
+}
+
+input ProjectsFilter {
+  ids: [ID]
+  limit: Int
+  offset: Int
+  search: String
+}
+
 type Query {
   currentUser: User
+  projects(filter: ProjectsFilter): [Project]
 }