Merge branch '262860-graphql' into 'master'

Add graphql type for oncall shifts

See merge request gitlab-org/gitlab!50006

doc/api/graphql/reference/gitlab_schema.graphql

@@ -11661,6 +11661,41 @@ type IncidentManagementOncallRotation {
     last: Int
   ): OncallParticipantTypeConnection
 
+  """
+  Blocks of time for which a participant is on-call within a given timeframe. Timeframe cannot exceed one month.
+  """
+  shifts(
+    """
+    Returns the elements in the list that come after the specified cursor.
+    """
+    after: String
+
+    """
+    Returns the elements in the list that come before the specified cursor.
+    """
+    before: String
+
+    """
+    End of timeframe to include shifts for. Cannot exceed one month after start.
+    """
+    endTime: Time!
+
+    """
+    Returns the first _n_ elements from the list.
+    """
+    first: Int
+
+    """
+    Returns the last _n_ elements from the list.
+    """
+    last: Int
+
+    """
+    Start of timeframe to include shifts for.
+    """
+    startTime: Time!
+  ): IncidentManagementOncallShiftConnection
+
   """
   Start date of the on-call rotation.
   """
@@ -11792,6 +11827,61 @@ type IncidentManagementOncallScheduleEdge {
   node: IncidentManagementOncallSchedule
 }
 
+"""
+A block of time for which a participant is on-call.
+"""
+type IncidentManagementOncallShift {
+  """
+  End time of the on-call shift.
+  """
+  endsAt: Time
+
+  """
+  Participant assigned to the on-call shift.
+  """
+  participant: OncallParticipantType
+
+  """
+  Start time of the on-call shift.
+  """
+  startsAt: Time
+}
+
+"""
+The connection type for IncidentManagementOncallShift.
+"""
+type IncidentManagementOncallShiftConnection {
+  """
+  A list of edges.
+  """
+  edges: [IncidentManagementOncallShiftEdge]
+
+  """
+  A list of nodes.
+  """
+  nodes: [IncidentManagementOncallShift]
+
+  """
+  Information to aid in pagination.
+  """
+  pageInfo: PageInfo!
+}
+
+"""
+An edge in a connection.
+"""
+type IncidentManagementOncallShiftEdge {
+  """
+  A cursor for use in pagination.
+  """
+  cursor: String!
+
+  """
+  The item at the end of the edge.
+  """
+  node: IncidentManagementOncallShift
+}
+
 type InstanceSecurityDashboard {
   """
   Projects selected in Instance Security Dashboard

doc/api/graphql/reference/gitlab_schema.json

@@ -31818,6 +31818,87 @@
               "isDeprecated": false,
               "deprecationReason": null
             },
+            {
+              "name": "shifts",
+              "description": "Blocks of time for which a participant is on-call within a given timeframe. Timeframe cannot exceed one month.",
+              "args": [
+                {
+                  "name": "startTime",
+                  "description": "Start of timeframe to include shifts for.",
+                  "type": {
+                    "kind": "NON_NULL",
+                    "name": null,
+                    "ofType": {
+                      "kind": "SCALAR",
+                      "name": "Time",
+                      "ofType": null
+                    }
+                  },
+                  "defaultValue": null
+                },
+                {
+                  "name": "endTime",
+                  "description": "End of timeframe to include shifts for. Cannot exceed one month after start.",
+                  "type": {
+                    "kind": "NON_NULL",
+                    "name": null,
+                    "ofType": {
+                      "kind": "SCALAR",
+                      "name": "Time",
+                      "ofType": null
+                    }
+                  },
+                  "defaultValue": null
+                },
+                {
+                  "name": "after",
+                  "description": "Returns the elements in the list that come after the specified cursor.",
+                  "type": {
+                    "kind": "SCALAR",
+                    "name": "String",
+                    "ofType": null
+                  },
+                  "defaultValue": null
+                },
+                {
+                  "name": "before",
+                  "description": "Returns the elements in the list that come before the specified cursor.",
+                  "type": {
+                    "kind": "SCALAR",
+                    "name": "String",
+                    "ofType": null
+                  },
+                  "defaultValue": null
+                },
+                {
+                  "name": "first",
+                  "description": "Returns the first _n_ elements from the list.",
+                  "type": {
+                    "kind": "SCALAR",
+                    "name": "Int",
+                    "ofType": null
+                  },
+                  "defaultValue": null
+                },
+                {
+                  "name": "last",
+                  "description": "Returns the last _n_ elements from the list.",
+                  "type": {
+                    "kind": "SCALAR",
+                    "name": "Int",
+                    "ofType": null
+                  },
+                  "defaultValue": null
+                }
+              ],
+              "type": {
+                "kind": "OBJECT",
+                "name": "IncidentManagementOncallShiftConnection",
+                "ofType": null
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
             {
               "name": "startsAt",
               "description": "Start date of the on-call rotation.",
@@ -32212,6 +32293,173 @@
           "enumValues": null,
           "possibleTypes": null
         },
+        {
+          "kind": "OBJECT",
+          "name": "IncidentManagementOncallShift",
+          "description": "A block of time for which a participant is on-call.",
+          "fields": [
+            {
+              "name": "endsAt",
+              "description": "End time of the on-call shift.",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "SCALAR",
+                "name": "Time",
+                "ofType": null
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
+            {
+              "name": "participant",
+              "description": "Participant assigned to the on-call shift.",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "OBJECT",
+                "name": "OncallParticipantType",
+                "ofType": null
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
+            {
+              "name": "startsAt",
+              "description": "Start time of the on-call shift.",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "SCALAR",
+                "name": "Time",
+                "ofType": null
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            }
+          ],
+          "inputFields": null,
+          "interfaces": [
+
+          ],
+          "enumValues": null,
+          "possibleTypes": null
+        },
+        {
+          "kind": "OBJECT",
+          "name": "IncidentManagementOncallShiftConnection",
+          "description": "The connection type for IncidentManagementOncallShift.",
+          "fields": [
+            {
+              "name": "edges",
+              "description": "A list of edges.",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "LIST",
+                "name": null,
+                "ofType": {
+                  "kind": "OBJECT",
+                  "name": "IncidentManagementOncallShiftEdge",
+                  "ofType": null
+                }
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
+            {
+              "name": "nodes",
+              "description": "A list of nodes.",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "LIST",
+                "name": null,
+                "ofType": {
+                  "kind": "OBJECT",
+                  "name": "IncidentManagementOncallShift",
+                  "ofType": null
+                }
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
+            {
+              "name": "pageInfo",
+              "description": "Information to aid in pagination.",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "NON_NULL",
+                "name": null,
+                "ofType": {
+                  "kind": "OBJECT",
+                  "name": "PageInfo",
+                  "ofType": null
+                }
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            }
+          ],
+          "inputFields": null,
+          "interfaces": [
+
+          ],
+          "enumValues": null,
+          "possibleTypes": null
+        },
+        {
+          "kind": "OBJECT",
+          "name": "IncidentManagementOncallShiftEdge",
+          "description": "An edge in a connection.",
+          "fields": [
+            {
+              "name": "cursor",
+              "description": "A cursor for use in pagination.",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "NON_NULL",
+                "name": null,
+                "ofType": {
+                  "kind": "SCALAR",
+                  "name": "String",
+                  "ofType": null
+                }
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
+            {
+              "name": "node",
+              "description": "The item at the end of the edge.",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "OBJECT",
+                "name": "IncidentManagementOncallShift",
+                "ofType": null
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            }
+          ],
+          "inputFields": null,
+          "interfaces": [
+
+          ],
+          "enumValues": null,
+          "possibleTypes": null
+        },
         {
           "kind": "OBJECT",
           "name": "InstanceSecurityDashboard",

doc/api/graphql/reference/index.md

@@ -1777,6 +1777,7 @@ Describes an incident management on-call rotation.
 | `lengthUnit` | OncallRotationUnitEnum | Unit of the on-call rotation length. |
 | `name` | String! | Name of the on-call rotation. |
 | `participants` | OncallParticipantTypeConnection | Participants of the on-call rotation. |
+| `shifts` | IncidentManagementOncallShiftConnection | Blocks of time for which a participant is on-call within a given timeframe. Timeframe cannot exceed one month. |
 | `startsAt` | Time | Start date of the on-call rotation. |
 
 ### IncidentManagementOncallSchedule
@@ -1791,6 +1792,16 @@ Describes an incident management on-call schedule.
 | `rotations` | IncidentManagementOncallRotationConnection! | On-call rotations for the on-call schedule |
 | `timezone` | String! | Time zone of the on-call schedule |
 
+### IncidentManagementOncallShift
+
+A block of time for which a participant is on-call..
+
+| Field | Type | Description |
+| ----- | ---- | ----------- |
+| `endsAt` | Time | End time of the on-call shift. |
+| `participant` | OncallParticipantType | Participant assigned to the on-call shift. |
+| `startsAt` | Time | Start time of the on-call shift. |
+
 ### InstanceSecurityDashboard
 
 | Field | Type | Description |

ee/app/graphql/resolvers/incident_management/oncall_shifts_resolver.rb

+# frozen_string_literal: true
+
+module Resolvers
+  module IncidentManagement
+    class OncallShiftsResolver < BaseResolver
+      alias_method :rotation, :synchronized_object
+
+      type Types::IncidentManagement::OncallShiftType.connection_type, null: true
+
+      argument :start_time,
+               ::Types::TimeType,
+               required: true,
+               description: 'Start of timeframe to include shifts for.'
+
+      argument :end_time,
+               ::Types::TimeType,
+               required: true,
+               description: 'End of timeframe to include shifts for. Cannot exceed one month after start.'
+
+      def resolve(start_time:, end_time:)
+        result = ::IncidentManagement::OncallShifts::ReadService.new(
+          rotation,
+          current_user,
+          start_time: start_time,
+          end_time: end_time
+        ).execute
+
+        raise Gitlab::Graphql::Errors::ResourceNotAvailable, result.errors.join(', ') if result.error?
+
+        result.payload[:shifts]
+      end
+    end
+  end
+end

ee/app/graphql/types/incident_management/oncall_rotation_type.rb

@@ -37,6 +37,12 @@ module Types
             ::Types::IncidentManagement::OncallParticipantType.connection_type,
             null: true,
             description: 'Participants of the on-call rotation.'
+
+      field :shifts,
+            ::Types::IncidentManagement::OncallShiftType.connection_type,
+            null: true,
+            description: 'Blocks of time for which a participant is on-call within a given timeframe. Timeframe cannot exceed one month.',
+            resolver: ::Resolvers::IncidentManagement::OncallShiftsResolver
     end
   end
 end

ee/app/graphql/types/incident_management/oncall_shift_type.rb

+# frozen_string_literal: true
+
+module Types
+  module IncidentManagement
+    class OncallShiftType < BaseObject
+      graphql_name 'IncidentManagementOncallShift'
+      description 'A block of time for which a participant is on-call.'
+
+      authorize :read_incident_management_oncall_schedule
+
+      field :participant,
+            ::Types::IncidentManagement::OncallParticipantType,
+            null: true,
+            description: 'Participant assigned to the on-call shift.'
+
+      field :starts_at,
+            Types::TimeType,
+            null: true,
+            description: 'Start time of the on-call shift.'
+
+      field :ends_at,
+            Types::TimeType,
+            null: true,
+            description: 'End time of the on-call shift.'
+    end
+  end
+end

ee/app/policies/incident_management/oncall_shift_policy.rb

+# frozen_string_literal: true
+
+module IncidentManagement
+  class OncallShiftPolicy < ::BasePolicy
+    delegate :rotation
+  end
+end

ee/app/services/incident_management/oncall_shifts/read_service.rb

@@ -3,32 +3,36 @@
 module IncidentManagement
   module OncallShifts
     class ReadService
+      MAXIMUM_TIMEFRAME = 1.month
+
       # @param rotation [IncidentManagement::OncallRotation]
       # @param current_user [User]
       # @param params [Hash<Symbol,Any>]
-      # @option params - starts_at [Time]
-      # @option params - ends_at [Time]
-      def initialize(rotation, current_user, starts_at:, ends_at:)
+      # @option params - start_time [Time]
+      # @option params - end_time [Time]
+      def initialize(rotation, current_user, start_time:, end_time:)
         @rotation = rotation
         @current_user = current_user
-        @starts_at = starts_at
-        @ends_at = ends_at
+        @start_time = start_time
+        @end_time = end_time
       end
 
       def execute
         return error_no_license unless available?
         return error_no_permissions unless allowed?
+        return error_invalid_range unless start_before_end?
+        return error_excessive_range unless under_max_timeframe?
 
         success(
           ::IncidentManagement::OncallShiftGenerator
           .new(rotation)
-          .for_timeframe(starts_at: starts_at, ends_at: ends_at)
+          .for_timeframe(starts_at: start_time, ends_at: end_time)
         )
       end
 
       private
 
-      attr_reader :rotation, :current_user, :starts_at, :ends_at
+      attr_reader :rotation, :current_user, :start_time, :end_time
 
       def available?
         ::Gitlab::IncidentManagement.oncall_schedules_available?(rotation.project)
@@ -38,6 +42,14 @@ module IncidentManagement
         Ability.allowed?(current_user, :read_incident_management_oncall_schedule, rotation)
       end
 
+      def start_before_end?
+        start_time < end_time
+      end
+
+      def under_max_timeframe?
+        end_time.to_date <= start_time.to_date + MAXIMUM_TIMEFRAME
+      end
+
       def error(message)
         ServiceResponse.error(message: message)
       end
@@ -53,6 +65,14 @@ module IncidentManagement
       def error_no_license
         error(_('Your license does not support on-call rotations'))
       end
+
+      def error_invalid_range
+        error(_('`start_time` should precede `end_time`'))
+      end
+
+      def error_excessive_range
+        error(_('`end_time` should not exceed one month after `start_time`'))
+      end
     end
   end
 end

ee/spec/factories/incident_management/oncall_shifts.rb

@@ -2,7 +2,7 @@
 
 FactoryBot.define do
   factory :incident_management_oncall_shift, class: 'IncidentManagement::OncallShift' do
-    association :participant, factory: :incident_management_oncall_participant
+    association :participant, :with_developer_access, factory: :incident_management_oncall_participant
     rotation { participant.rotation }
     starts_at { 5.days.ago }
     ends_at { 2.days.from_now }

ee/spec/graphql/resolvers/incident_management/oncall_shifts_resolver_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Resolvers::IncidentManagement::OncallShiftsResolver do
+  include GraphqlHelpers
+
+  let_it_be(:current_user) { create(:user) }
+  let_it_be(:rotation) { create(:incident_management_oncall_rotation, :with_participant) }
+  let_it_be(:project) { rotation.project }
+  let(:args) { { start_time: rotation.starts_at, end_time: rotation.starts_at + rotation.shift_duration } }
+
+  subject(:shifts) { sync(resolve_oncall_shifts(args)) }
+
+  before do
+    stub_licensed_features(oncall_schedules: true)
+    project.add_reporter(current_user)
+  end
+
+  specify do
+    expect(described_class).to have_nullable_graphql_type(Types::IncidentManagement::OncallShiftType.connection_type)
+  end
+
+  it 'returns on-call schedules' do
+    expect(shifts.length).to eq(1)
+    expect(shifts.first).to be_a(::IncidentManagement::OncallShift)
+    expect(shifts.first).to have_attributes(rotation: rotation, starts_at: args[:start_time], ends_at: args[:end_time])
+  end
+
+  context 'when an error occurs while finding shifts' do
+    subject(:shifts) { sync(resolve_oncall_shifts(args, current_user: nil)) }
+
+    it 'raises ResourceNotAvailable error' do
+      expect { subject }.to raise_error(Gitlab::Graphql::Errors::ResourceNotAvailable)
+    end
+  end
+
+  private
+
+  def resolve_oncall_shifts(args = {}, context = { current_user: current_user })
+    resolve(described_class, obj: rotation, args: args, ctx: context)
+  end
+end

ee/spec/graphql/types/incident_management/oncall_rotation_type_spec.rb

@@ -15,6 +15,7 @@ RSpec.describe GitlabSchema.types['IncidentManagementOncallRotation'] do
       length
       length_unit
       participants
+      shifts
     ]
 
     expect(described_class).to have_graphql_fields(*expected_fields)

ee/spec/graphql/types/incident_management/oncall_shift_type_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe GitlabSchema.types['IncidentManagementOncallShift'] do
+  specify { expect(described_class.graphql_name).to eq('IncidentManagementOncallShift') }
+
+  specify { expect(described_class).to require_graphql_authorizations(:read_incident_management_oncall_schedule) }
+
+  it 'exposes the expected fields' do
+    expected_fields = %i[
+      participant
+      starts_at
+      ends_at
+    ]
+
+    expect(described_class).to have_graphql_fields(*expected_fields)
+  end
+end

ee/spec/policies/incident_management/oncall_shift_policy_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe IncidentManagement::OncallShiftPolicy do
+  let_it_be_with_refind(:shift) { create(:incident_management_oncall_shift) }
+  let_it_be(:project) { shift.rotation.project }
+  let_it_be(:user) { create(:user) }
+
+  subject(:policy) { described_class.new(user, shift) }
+
+  before do
+    stub_feature_flags(oncall_schedules_mvc: project)
+    stub_licensed_features(oncall_schedules: true)
+  end
+
+  describe 'rules' do
+    it { is_expected.to be_disallowed :read_incident_management_oncall_schedule }
+
+    context 'when guest' do
+      before do
+        project.add_guest(user)
+      end
+
+      it { is_expected.to be_disallowed :read_incident_management_oncall_schedule }
+    end
+
+    context 'when reporter' do
+      before do
+        project.add_reporter(user)
+      end
+
+      it { is_expected.to be_allowed :read_incident_management_oncall_schedule }
+
+      context 'licensed feature disabled' do
+        before do
+          stub_licensed_features(oncall_schedules: false)
+        end
+
+        it { is_expected.to be_disallowed :read_incident_management_oncall_schedule }
+      end
+    end
+  end
+end

ee/spec/requests/api/graphql/project/incident_management/oncall_shifts_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe 'getting Incident Management on-call shifts' do
+  include GraphqlHelpers
+
+  let_it_be(:participant) { create(:incident_management_oncall_participant, :with_developer_access) }
+  let_it_be(:rotation) { participant.rotation }
+  let_it_be(:project) { rotation.project }
+  let_it_be(:current_user) { participant.user }
+
+  let(:starts_at) { rotation.starts_at }
+  let(:ends_at) { rotation.starts_at + rotation.shift_duration } # intentionally return one shift
+  let(:params) { { start_time: starts_at.iso8601, end_time: ends_at.iso8601 } }
+
+  let(:shift_fields) do
+    <<~QUERY
+      nodes {
+        participant { id }
+        endsAt
+        startsAt
+      }
+    QUERY
+  end
+
+  let(:schedule_fields) do
+    <<~QUERY
+      nodes {
+        rotations {
+          nodes {
+            #{query_graphql_field('shifts', params, shift_fields)}
+          }
+        }
+      }
+    QUERY
+  end
+
+  let(:query) do
+    graphql_query_for(
+      'project',
+      { 'fullPath' => project.full_path },
+      query_graphql_field('incidentManagementOncallSchedules', {}, schedule_fields)
+    )
+  end
+
+  let(:shifts) do
+    graphql_data
+      .dig('project', 'incidentManagementOncallSchedules', 'nodes').first
+      .dig('rotations', 'nodes').first
+      .dig('shifts', 'nodes')
+  end
+
+  before do
+    stub_licensed_features(oncall_schedules: true)
+    post_graphql(query, current_user: current_user)
+  end
+
+  it_behaves_like 'a working graphql query'
+
+  it 'returns the correct properties of the on-call shifts' do
+    expect(shifts.first).to include(
+      'participant' => { 'id' => participant.to_global_id.to_s },
+      'startsAt' => params[:start_time],
+      'endsAt' => params[:end_time]
+    )
+  end
+
+  context "without required argument starts_at" do
+    let(:params) { { end_time: ends_at.iso8601 } }
+
+    it 'raises an exception' do
+      expect(graphql_errors).to include(a_hash_including('message' => "Field 'shifts' is missing required arguments: startTime"))
+    end
+  end
+
+  context "without required argument ends_at" do
+    let(:params) { { start_time: starts_at.iso8601 } }
+
+    it 'raises an exception' do
+      expect(graphql_errors).to include(a_hash_including('message' => "Field 'shifts' is missing required arguments: endTime"))
+    end
+  end
+end

ee/spec/services/incident_management/oncall_shifts/read_service_spec.rb

@@ -3,13 +3,14 @@
 require 'spec_helper'
 
 RSpec.describe ::IncidentManagement::OncallShifts::ReadService do
-  let_it_be_with_refind(:rotation) { create(:incident_management_oncall_rotation, :with_participant) }
+  let_it_be_with_refind(:rotation) { create(:incident_management_oncall_rotation) }
+  let_it_be(:participant) { create(:incident_management_oncall_participant, :with_developer_access, rotation: rotation) }
   let_it_be(:project) { rotation.project }
   let_it_be(:user_with_permissions) { create(:user) }
   let_it_be(:user_without_permissions) { create(:user) }
   let_it_be(:current_user) { user_with_permissions }
 
-  let(:params) { { starts_at: 15.minutes.since(rotation.starts_at), ends_at: 3.weeks.since(rotation.starts_at) } }
+  let(:params) { { start_time: 15.minutes.since(rotation.starts_at), end_time: 3.weeks.since(rotation.starts_at) } }
   let(:service) { described_class.new(rotation, current_user, params) }
 
   before_all do
@@ -42,6 +43,18 @@ RSpec.describe ::IncidentManagement::OncallShifts::ReadService do
       it_behaves_like 'error response', 'You have insufficient permissions to view shifts for this rotation'
     end
 
+    context 'when the start time is after the end time' do
+      let(:params) { { start_time: rotation.starts_at, end_time: rotation.starts_at - 1.day } }
+
+      it_behaves_like 'error response', '`start_time` should precede `end_time`'
+    end
+
+    context 'when timeframe exceeds one month' do
+      let(:params) { { start_time: rotation.starts_at, end_time: rotation.starts_at + 1.month + 1.day } }
+
+      it_behaves_like 'error response', '`end_time` should not exceed one month after `start_time`'
+    end
+
     context 'when feature is not available' do
       before do
         stub_licensed_features(oncall_schedules: false)
@@ -67,8 +80,14 @@ RSpec.describe ::IncidentManagement::OncallShifts::ReadService do
         expect(shifts).to all(be_a(::IncidentManagement::OncallShift))
         expect(shifts).to all(be_valid)
         expect(shifts.sort_by(&:starts_at)).to eq(shifts)
-        expect(shifts.first.starts_at).to be <= params[:starts_at]
-        expect(shifts.last.ends_at).to be >= params[:ends_at]
+        expect(shifts.first.starts_at).to be <= params[:start_time]
+        expect(shifts.last.ends_at).to be >= params[:end_time]
+      end
+
+      context 'when timeframe is exactly 1 month' do
+        let(:params) { { start_time: rotation.starts_at.beginning_of_day, end_time: (rotation.starts_at + 1.month).end_of_day } }
+
+        it { is_expected.to be_success }
       end
     end
   end

locale/gitlab.pot

@@ -33038,6 +33038,12 @@ msgstr ""
 msgid "[No reason]"
 msgstr ""
 
+msgid "`end_time` should not exceed one month after `start_time`"
+msgstr ""
+
+msgid "`start_time` should precede `end_time`"
+msgstr ""
+
 msgid "a deleted user"
 msgstr ""