diff --git a/app/models/recruitment_cycle_timetable.rb b/app/models/recruitment_cycle_timetable.rb
index d9e7276d2b9..0525ce596d6 100644
--- a/app/models/recruitment_cycle_timetable.rb
+++ b/app/models/recruitment_cycle_timetable.rb
@@ -54,16 +54,14 @@ def cycle_range
   end
 
   def sequential_dates
-    required_dates = [
+    return if [
       find_opens_at,
       apply_opens_at,
       apply_deadline_at,
       reject_by_default_at,
       decline_by_default_at,
       find_closes_at,
-    ]
-
-    return if required_dates.any?(&:blank?)
+    ].any?(&:blank?)
 
     if find_opens_at > apply_opens_at
       errors.add(:apply_opens_at, :apply_opens_after_find_opens)
diff --git a/app/services/data_migrations/add_all_recruitment_cycle_timetables_to_database.rb b/app/services/data_migrations/add_all_recruitment_cycle_timetables_to_database.rb
new file mode 100644
index 00000000000..8046c1dd366
--- /dev/null
+++ b/app/services/data_migrations/add_all_recruitment_cycle_timetables_to_database.rb
@@ -0,0 +1,22 @@
+module DataMigrations
+  class AddAllRecruitmentCycleTimetablesToDatabase
+    TIMESTAMP = 20250129093844
+    MANUAL_RUN = false
+
+    def change
+      CYCLE_DATES.each do |recruitment_cycle_year, dates|
+        RecruitmentCycleTimetable.create(
+          recruitment_cycle_year:,
+          find_opens_at: dates[:find_opens],
+          apply_opens_at: dates[:apply_opens],
+          apply_deadline_at: dates[:apply_deadline],
+          reject_by_default_at: dates[:reject_by_default],
+          decline_by_default_at: dates[:find_closes] - 1.day,
+          find_closes_at: dates[:find_closes],
+          christmas_holiday_range: dates.dig(:holidays, :christmas),
+          easter_holiday_range: dates.dig(:holidays, :easter),
+        )
+      end
+    end
+  end
+end
diff --git a/config/initializers/cycle_timetables.rb b/config/initializers/cycle_timetables.rb
index 13ba9f3842d..2fff2872b57 100644
--- a/config/initializers/cycle_timetables.rb
+++ b/config/initializers/cycle_timetables.rb
@@ -37,7 +37,7 @@
     reject_by_default: Time.zone.local(2026, 9, 24, 23, 59, 59), # CONFIRMED
     find_closes: Time.zone.local(2026, 9, 30, 23, 59, 59), # CONFIRMED
     holidays: {
-      christmas: Date.new(2026, 12, 18)..Date.new(2026, 1, 5), # TBD
+      christmas: Date.new(2025, 12, 18)..Date.new(2026, 1, 5), # TBD
       easter: Date.new(2026, 3, 23)..Date.new(2026, 4, 6), # TBD
     },
   },
@@ -55,7 +55,7 @@
     find_closes: Time.zone.local(2027, 9, 30, 23, 59, 59), # TBD
     holidays: {
       christmas: Date.new(2026, 12, 18)..Date.new(2027, 1, 5), # TBD
-      easter: Date.new(2026, 3, 15)..Date.new(2027, 3, 29), # TBD
+      easter: Date.new(2027, 3, 15)..Date.new(2027, 3, 29), # TBD
     },
   },
 }.freeze
@@ -79,7 +79,7 @@
     apply_1_deadline: Time.zone.local(2020, 8, 24, 18),
     apply_2_deadline: Time.zone.local(2020, 9, 18, 18),
     apply_deadline: Time.zone.local(2020, 9, 18, 18), # Adding an 'apply_deadline' for backward compatibility.
-    reject_by_default: Time.zone.local(2021, 9, 29, 23, 59, 59),
+    reject_by_default: Time.zone.local(2020, 9, 29, 23, 59, 59),
     find_closes: Time.zone.local(2020, 10, 3, 23, 59, 59),
     holidays: {},
   },
diff --git a/lib/tasks/data.rake b/lib/tasks/data.rake
index d9d5773e850..fe9030d2a9b 100644
--- a/lib/tasks/data.rake
+++ b/lib/tasks/data.rake
@@ -1,5 +1,6 @@
 DATA_MIGRATION_SERVICES = [
   # do not delete or edit this line - services added below by generator
+  'DataMigrations::AddAllRecruitmentCycleTimetablesToDatabase',
   'DataMigrations::RemoveOneLoginPreReleaseBannersFeatureFlag',
   'DataMigrations::RemoveNewWithdrawalReasonsFeatureFlag',
   'DataMigrations::RemoveUnusedFeatureFlags',
diff --git a/spec/services/data_migrations/add_all_recruitment_cycle_timetables_to_database_spec.rb b/spec/services/data_migrations/add_all_recruitment_cycle_timetables_to_database_spec.rb
new file mode 100644
index 00000000000..76d70c461e7
--- /dev/null
+++ b/spec/services/data_migrations/add_all_recruitment_cycle_timetables_to_database_spec.rb
@@ -0,0 +1,24 @@
+require 'rails_helper'
+
+RSpec.describe DataMigrations::AddAllRecruitmentCycleTimetablesToDatabase do
+  it 'adds all recruitment cycles to database' do
+    described_class.new.change
+    expect(RecruitmentCycleTimetable.pluck(:recruitment_cycle_year))
+      .to contain_exactly(2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026, 2027)
+  end
+
+  it 'handles holidays as expected' do
+    described_class.new.change
+    year_without_holidays = RecruitmentCycleTimetable.find_by(recruitment_cycle_year: 2020)
+    year_with_holidays = RecruitmentCycleTimetable.find_by(recruitment_cycle_year: 2021)
+
+    expect(year_without_holidays.easter_holiday_range).to be_nil
+    expect(year_without_holidays.christmas_holiday_range).to be_nil
+
+    expect(year_with_holidays.easter_holiday_range.begin).to eq Date.new(2021, 4, 2)
+    expect(year_with_holidays.easter_holiday_range.end).to eq Date.new(2021, 4, 17)
+
+    expect(year_with_holidays.christmas_holiday_range.begin).to eq Date.new(2020, 12, 20)
+    expect(year_with_holidays.christmas_holiday_range.end).to eq Date.new(2021, 1, 2)
+  end
+end