diff --git a/server/models/adminAlertDismissal.js b/server/models/adminAlertDismissal.js
new file mode 100644
index 0000000..06d902d
--- /dev/null
+++ b/server/models/adminAlertDismissal.js
@@ -0,0 +1,39 @@
+import mongoose from 'mongoose'
+
+export const ADMIN_ALERT_TYPES = [
+  'slack_invite_failed',
+  'no_slack_handle_week',
+  'stuck_pending_payment',
+  'member_suspended',
+  'preregistrant_selected_not_invited',
+  'preregistrant_expired',
+  'event_draft_imminent',
+  'event_near_capacity',
+  'tag_suggestions_pending'
+]
+
+const adminAlertDismissalSchema = new mongoose.Schema({
+  adminId: {
+    type: mongoose.Schema.Types.ObjectId,
+    ref: 'Member',
+    required: true
+  },
+  alertType: {
+    type: String,
+    enum: ADMIN_ALERT_TYPES,
+    required: true
+  },
+  signature: {
+    type: String,
+    required: true
+  },
+  dismissedAt: {
+    type: Date,
+    default: Date.now
+  }
+})
+
+adminAlertDismissalSchema.index({ adminId: 1, alertType: 1 }, { unique: true })
+
+export default mongoose.models.AdminAlertDismissal ||
+  mongoose.model('AdminAlertDismissal', adminAlertDismissalSchema)
diff --git a/tests/server/models/adminAlertDismissal.test.js b/tests/server/models/adminAlertDismissal.test.js
new file mode 100644
index 0000000..0cfce44
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+++ b/tests/server/models/adminAlertDismissal.test.js
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+import { describe, it, expect } from 'vitest'
+import AdminAlertDismissal from '../../../server/models/adminAlertDismissal.js'
+
+describe('AdminAlertDismissal model', () => {
+  it('exposes the expected schema paths', () => {
+    const paths = AdminAlertDismissal.schema.paths
+    expect(paths.adminId).toBeDefined()
+    expect(paths.alertType).toBeDefined()
+    expect(paths.signature).toBeDefined()
+    expect(paths.dismissedAt).toBeDefined()
+  })
+
+  it('marks adminId, alertType, and signature as required', () => {
+    const paths = AdminAlertDismissal.schema.paths
+    expect(paths.adminId.isRequired).toBe(true)
+    expect(paths.alertType.isRequired).toBe(true)
+    expect(paths.signature.isRequired).toBe(true)
+  })
+
+  it('restricts alertType to the nine known slugs', () => {
+    const enumValues = AdminAlertDismissal.schema.paths.alertType.enumValues
+    expect(enumValues).toEqual([
+      'slack_invite_failed',
+      'no_slack_handle_week',
+      'stuck_pending_payment',
+      'member_suspended',
+      'preregistrant_selected_not_invited',
+      'preregistrant_expired',
+      'event_draft_imminent',
+      'event_near_capacity',
+      'tag_suggestions_pending'
+    ])
+  })
+
+  it('declares a unique compound index on adminId + alertType', () => {
+    const indexes = AdminAlertDismissal.schema.indexes()
+    const compound = indexes.find(([fields]) =>
+      fields.adminId === 1 && fields.alertType === 1
+    )
+    expect(compound).toBeDefined()
+    expect(compound[1].unique).toBe(true)
+  })
+})