diff --git a/AGENTS.md b/AGENTS.md
index 375ebb393d..e03d3a5af4 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -510,7 +510,7 @@ RuboCop linting on PRs and pushes to main.
 
 ## Rake Tasks
 
-Located in `lib/tasks/` (9 files):
+Located in `lib/tasks/` (10 files):
 - `dev.rake` — Development database seeding from XML/CSV
 - `rhino_migrator.rake` — Rich text editor migration
 - `attachment_report.rake` — Attachment reporting
@@ -520,4 +520,4 @@ Located in `lib/tasks/` (9 files):
 - `migrate_sectors.rake` — Sector data migration
 - `import_stories.rake` — Imports stories from a WordPress Posts Export CSV (`StoryImporter`)
 - `migrate_workshop_logs.rake` — Workshop log migration
-- `migrate_sectors.rake` — Sector data migration
+- `backfill_affiliation_facilitator.rake` — One-off post-deploy backfill of `affiliations.facilitator` from the title
diff --git a/app/frontend/javascript/controllers/affiliation_dates_controller.js b/app/frontend/javascript/controllers/affiliation_dates_controller.js
index 88013eed64..7c4731f5f6 100644
--- a/app/frontend/javascript/controllers/affiliation_dates_controller.js
+++ b/app/frontend/javascript/controllers/affiliation_dates_controller.js
@@ -1,4 +1,5 @@
 import { Controller } from "@hotwired/stimulus"
+import { isFacilitatorTitle } from "../lib/affiliation"
 
 export default class extends Controller {
   static targets = ["facilitatorSince", "affiliatedNote", "affiliatedNoteText", "memberSinceFlag", "affiliationsContainer", "programStatus"]
@@ -51,11 +52,7 @@ export default class extends Controller {
     const now = new Date()
     const today = new Date(Date.UTC(now.getFullYear(), now.getMonth(), now.getDate()))
 
-    // Mirrors Affiliation#facilitator?: exact, case-sensitive, trimmed — so the
-    // live figure matches the server render.
-    const facilitatorAffiliations = affiliations.filter(a =>
-      a.title.trim() === "Facilitator"
-    )
+    const facilitatorAffiliations = affiliations.filter(a => isFacilitatorTitle(a.title))
     const facStartDates = facilitatorAffiliations.map(a => a.startDate).filter(Boolean)
     const facilitatorSince = facStartDates.length
       ? new Date(Math.min(...facStartDates.map(d => new Date(d))))
diff --git a/app/frontend/javascript/controllers/affiliation_facilitator_warning_controller.js b/app/frontend/javascript/controllers/affiliation_facilitator_warning_controller.js
index 702edbf6a8..4260502dd9 100644
--- a/app/frontend/javascript/controllers/affiliation_facilitator_warning_controller.js
+++ b/app/frontend/javascript/controllers/affiliation_facilitator_warning_controller.js
@@ -1,4 +1,5 @@
 import { Controller } from "@hotwired/stimulus";
+import { isFacilitatorTitle } from "../lib/affiliation";
 
 // Connects to data-controller="affiliation-facilitator-warning"
 //
@@ -65,8 +66,7 @@ export default class extends Controller {
       startDate,
       endDate,
       destroyed,
-      // Mirror Affiliation#facilitator?: exact, case-sensitive "Facilitator" (trimmed).
-      facilitator: title.trim() === "Facilitator",
+      facilitator: isFacilitatorTitle(title),
     };
   }
 
diff --git a/app/frontend/javascript/controllers/inactive_toggle_controller.js b/app/frontend/javascript/controllers/inactive_toggle_controller.js
index 5dad1705e6..3083aeff31 100644
--- a/app/frontend/javascript/controllers/inactive_toggle_controller.js
+++ b/app/frontend/javascript/controllers/inactive_toggle_controller.js
@@ -1,4 +1,5 @@
 import { Controller } from "@hotwired/stimulus";
+import { isFacilitatorTitle } from "../lib/affiliation";
 
 // Live styling for the affiliation editor row as you edit, before saving. Four
 // states by colour: role is the hue (facilitator = purple, else blue) and status
@@ -92,9 +93,7 @@ export default class extends Controller {
     return this.expiredValue;
   }
 
-  // Mirror Affiliation#facilitator? — an exact, case-sensitive match on
-  // "Facilitator" (trimmed), so the live styling matches what the server renders.
   isFacilitator() {
-    return this.hasTitleTarget && this.titleTarget.value.trim() === "Facilitator";
+    return this.hasTitleTarget && isFacilitatorTitle(this.titleTarget.value);
   }
 }
diff --git a/app/frontend/javascript/lib/affiliation.js b/app/frontend/javascript/lib/affiliation.js
new file mode 100644
index 0000000000..32fb8aa5af
--- /dev/null
+++ b/app/frontend/javascript/lib/affiliation.js
@@ -0,0 +1,9 @@
+// The single JS source of truth for "is this the standing Facilitator
+// affiliation?", mirroring Ruby's Affiliation#facilitator? / .facilitators: the
+// title must be *exactly* "Facilitator" (trimmed, case-sensitive). Variants like
+// "Lead Facilitator" or "facilitator" are deliberately excluded. The affiliation
+// editors drive their live preview off the typed title, so they compare the input
+// value through this helper rather than the persisted boolean.
+export const facilitatorTitle = "Facilitator"
+
+export const isFacilitatorTitle = (title) => (title ?? "").trim() === facilitatorTitle
diff --git a/app/models/affiliation.rb b/app/models/affiliation.rb
index 94f9fd650c..3a4e5c16d2 100644
--- a/app/models/affiliation.rb
+++ b/app/models/affiliation.rb
@@ -49,11 +49,10 @@ class Affiliation < ApplicationRecord
       .where("affiliations.end_date IS NULL OR affiliations.end_date >= ?", date)
   }
 
-  # Only the exact, case-sensitive title "Facilitator" counts — variants like
-  # "Lead Facilitator" or "facilitator" are deliberately excluded. BINARY forces
-  # a case-sensitive comparison under MySQL's default case-insensitive collation;
-  # TRIM mirrors the in-memory #facilitator? strip so stray whitespace still matches.
-  scope :facilitators, -> { where("BINARY TRIM(title) = ?", "Facilitator") }
+  # Reads the denormalized `facilitator` flag, which #sync_facilitator_from_title
+  # keeps in lock-step with the title rule (exactly "Facilitator", trimmed,
+  # case-sensitive). An executable agreement spec locks the column to that rule.
+  scope :facilitators, -> { where(facilitator: true) }
 
   # Affiliations whose #status_on(date) equals the given status, expressed in SQL
   # so it composes as a subquery (e.g. person-id narrowing). Kept in lock-step with
@@ -78,6 +77,7 @@ class Affiliation < ApplicationRecord
     end
   }
 
+  before_validation :sync_facilitator_from_title
   before_validation :skip_if_duplicate
   # Runs before validation so a reassigned org drops its stale organization_address_id
   # before organization_address_belongs_to_organization would reject it.
@@ -89,13 +89,11 @@ class Affiliation < ApplicationRecord
   after_destroy :sync_organization_affiliation_dates
 
   # Methods
-  # A facilitator affiliation is one whose title is *exactly* "Facilitator"
-  # (trimmed, case-sensitive). Variants like "Lead Facilitator" or "facilitator"
-  # are deliberately excluded. Mirrors the .facilitators scope so in-memory and
-  # SQL checks agree.
-  def facilitator?
-    title.to_s.strip == "Facilitator"
-  end
+  # `facilitator?` is the boolean column's auto-generated reader. A facilitator
+  # affiliation is one whose title is *exactly* "Facilitator" (trimmed,
+  # case-sensitive); #sync_facilitator_from_title keeps the column in step with
+  # that rule on every save, so #facilitator? and the .facilitators scope agree.
+  # Variants like "Lead Facilitator" or "facilitator" are deliberately excluded.
 
   # Current: not flagged inactive and not past its end date. Mirrors the `active`
   # scope so already-loaded affiliations can be filtered in Ruby without another
@@ -169,6 +167,14 @@ def set_inactive_from_dates
     self.inactive = end_date.present? && end_date < Date.current
   end
 
+  # Keep the denormalized flag in step with the title rule (exactly "Facilitator",
+  # trimmed, case-sensitive) on every save, so the .facilitators scope and
+  # #facilitator? agree. Invariant: never write `title` via update_columns /
+  # update_all — that skips this callback and lets the flag drift.
+  def sync_facilitator_from_title
+    self.facilitator = title.to_s.strip == FACILITATOR_TITLE
+  end
+
   def sync_organization_affiliation_dates
     org = organization
     affiliations = org.affiliations.where.not(id: destroyed_by_association ? id : nil)
diff --git a/db/migrate/20260819125941_add_facilitator_to_affiliations.rb b/db/migrate/20260819125941_add_facilitator_to_affiliations.rb
new file mode 100644
index 0000000000..3dc80927e7
--- /dev/null
+++ b/db/migrate/20260819125941_add_facilitator_to_affiliations.rb
@@ -0,0 +1,15 @@
+class AddFacilitatorToAffiliations < ActiveRecord::Migration[8.1]
+  # Denormalized cache of "is this the standing Facilitator affiliation?", kept in
+  # sync from the title by Affiliation. Replaces the raw BINARY TRIM(title) scope.
+  # Schema only — existing rows are backfilled by the affiliations:backfill_facilitator
+  # rake task after deploy (see lib/tasks).
+  def up
+    return if column_exists?(:affiliations, :facilitator)
+
+    add_column :affiliations, :facilitator, :boolean, null: false, default: false
+  end
+
+  def down
+    remove_column :affiliations, :facilitator, if_exists: true
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 1581f5f647..2e7223bb04 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -108,6 +108,7 @@
     t.datetime "created_at", precision: nil, null: false
     t.date "end_date"
     t.bigint "event_registration_id"
+    t.boolean "facilitator", default: false, null: false
     t.string "filemaker_code"
     t.boolean "inactive", default: false, null: false
     t.bigint "organization_address_id"
diff --git a/lib/tasks/backfill_affiliation_facilitator.rake b/lib/tasks/backfill_affiliation_facilitator.rake
new file mode 100644
index 0000000000..490ca9b1b1
--- /dev/null
+++ b/lib/tasks/backfill_affiliation_facilitator.rake
@@ -0,0 +1,11 @@
+namespace :affiliations do
+  desc "Backfill the affiliations.facilitator flag from the title (one-off, post-deploy)"
+  task backfill_facilitator: :environment do
+    # Same rule as the retired .facilitators SQL scope: exactly "Facilitator",
+    # trimmed, case-sensitive. update_all is deliberate — the value is computed
+    # inline, so no per-row callback is needed and this stays a single bulk write.
+    scope = Affiliation.where("BINARY TRIM(title) = ?", "Facilitator")
+    count = scope.update_all(facilitator: true)
+    puts "Backfilled facilitator: true on #{count} affiliation(s)."
+  end
+end
diff --git a/spec/models/affiliation_spec.rb b/spec/models/affiliation_spec.rb
index fa1ff6a1a2..3915524bfc 100644
--- a/spec/models/affiliation_spec.rb
+++ b/spec/models/affiliation_spec.rb
@@ -118,26 +118,43 @@
     end
   end
 
-  describe '#facilitator?' do
+  describe '#facilitator? (synced from title on validation)' do
+    # #facilitator? reads the denormalized column, which sync_facilitator_from_title
+    # sets in before_validation — so validate before reading it.
+    def facilitator_flag(title)
+      build(:affiliation, title: title).tap(&:validate).facilitator?
+    end
+
     it 'is true for the exact title "Facilitator"' do
-      expect(build(:affiliation, title: "Facilitator").facilitator?).to be true
+      expect(facilitator_flag("Facilitator")).to be true
     end
 
     it 'ignores surrounding whitespace' do
-      expect(build(:affiliation, title: "  Facilitator ").facilitator?).to be true
+      expect(facilitator_flag("  Facilitator ")).to be true
     end
 
     it 'is false for title variants like "Lead Facilitator"' do
-      expect(build(:affiliation, title: "Lead Facilitator").facilitator?).to be false
+      expect(facilitator_flag("Lead Facilitator")).to be false
     end
 
     it 'is case-sensitive' do
-      expect(build(:affiliation, title: "facilitator").facilitator?).to be false
-      expect(build(:affiliation, title: "FACILITATOR").facilitator?).to be false
+      expect(facilitator_flag("facilitator")).to be false
+      expect(facilitator_flag("FACILITATOR")).to be false
     end
 
     it 'is false when the title is blank' do
-      expect(build(:affiliation, title: nil).facilitator?).to be false
+      expect(facilitator_flag(nil)).to be false
+    end
+
+    it 'flips the column when a row is retitled to or from "Facilitator"' do
+      affiliation = create(:affiliation, title: "Facilitator")
+      expect(affiliation.facilitator?).to be true
+
+      affiliation.update!(title: "Lead Facilitator")
+      expect(affiliation.reload.facilitator?).to be false
+
+      affiliation.update!(title: "Facilitator")
+      expect(affiliation.reload.facilitator?).to be true
     end
   end
 
@@ -150,6 +167,17 @@
     it 'includes only the exact, case-sensitive title "Facilitator" (whitespace-trimmed)' do
       expect(described_class.facilitators).to contain_exactly(exact, whitespace)
     end
+
+    it 'returns exactly the rows whose title matches the rule (column ↔ scope agree)' do
+      expected = described_class.all.select { |a| a.title.to_s.strip == "Facilitator" }.map(&:id).sort
+      expect(described_class.facilitators.ids.sort).to eq(expected)
+    end
+
+    it 'keeps the persisted facilitator column in step with the title rule' do
+      described_class.find_each do |affiliation|
+        expect(affiliation.facilitator).to eq(affiliation.title.to_s.strip == "Facilitator")
+      end
+    end
   end
 
   describe '#sync_organization_status_with_affiliations' do