diff --git a/worklenz-backend/database/pg-migrations/1791364628703_fix_recurring_tasks_immutable_index.js b/worklenz-backend/database/pg-migrations/1791364628703_fix_recurring_tasks_immutable_index.js
new file mode 100644
index 000000000..045c3a1cc
--- /dev/null
+++ b/worklenz-backend/database/pg-migrations/1791364628703_fix_recurring_tasks_immutable_index.js
@@ -0,0 +1,54 @@
+'use strict';
+
+/**
+ * Forward migration to ensure the recurring tasks unique index uses the
+ * immutable UTC date expression on tasks.end_date (which is TIMESTAMP WITH TIME ZONE).
+ *
+ * tasks.end_date is TIMESTAMPTZ (database/sql/1_tables.sql). In PostgreSQL:
+ *   - Casting TIMESTAMPTZ directly to DATE (end_date::DATE) depends on the session
+ *     TimeZone setting and is therefore STABLE, which causes PostgreSQL to reject
+ *     it in index expressions with "functions in index expression must be marked IMMUTABLE".
+ *   - Converting with AT TIME ZONE 'UTC' produces a TIMESTAMP (without time zone)
+ *     at a fixed reference point, making ((end_date AT TIME ZONE 'UTC')::DATE) IMMUTABLE.
+ *
+ * This migration idempotently ensures idx_tasks_schedule_end_date_unique exists
+ * with the correct immutable UTC expression, and restores the prior baseline
+ * uniqueness constraint on tasks (schedule_id, end_date) upon rollback.
+ */
+
+/** @type {import('node-pg-migrate').ColumnDefinitions | undefined} */
+exports.shorthands = undefined;
+
+/** @param {import('node-pg-migrate').MigrationBuilder} pgm */
+exports.up = async (pgm) => {
+  pgm.sql(`
+-- ============================================================================
+-- Fix idx_tasks_schedule_end_date_unique
+-- Recreate the unique index with the immutable UTC expression for TIMESTAMPTZ:
+-- ((end_date AT TIME ZONE 'UTC')::DATE)
+-- ============================================================================
+
+DROP INDEX IF EXISTS idx_tasks_schedule_end_date_unique;
+
+CREATE UNIQUE INDEX idx_tasks_schedule_end_date_unique
+ON tasks (schedule_id, ((end_date AT TIME ZONE 'UTC')::DATE))
+WHERE schedule_id IS NOT NULL AND end_date IS NOT NULL;
+  `);
+};
+
+/** @param {import('node-pg-migrate').MigrationBuilder} pgm */
+exports.down = async (pgm) => {
+  pgm.sql(`
+-- ============================================================================
+-- Restore preceding baseline idx_tasks_schedule_end_date_unique
+-- Recreate the prior unique index using the baseline raw timestamp key
+-- from database/sql/1_tables.sql to maintain uniqueness on rollback.
+-- ============================================================================
+
+DROP INDEX IF EXISTS idx_tasks_schedule_end_date_unique;
+
+CREATE UNIQUE INDEX idx_tasks_schedule_end_date_unique
+ON tasks (schedule_id, end_date)
+WHERE schedule_id IS NOT NULL AND end_date IS NOT NULL;
+  `);
+};
diff --git a/worklenz-backend/src/tests/recurring-tasks-migration-roundtrip.spec.ts b/worklenz-backend/src/tests/recurring-tasks-migration-roundtrip.spec.ts
new file mode 100644
index 000000000..406645258
--- /dev/null
+++ b/worklenz-backend/src/tests/recurring-tasks-migration-roundtrip.spec.ts
@@ -0,0 +1,53 @@
+import path from "path";
+
+interface Migration {
+  up: (builder: { sql: (statement: string) => void }) => Promise<void>;
+  down: (builder: { sql: (statement: string) => void }) => Promise<void>;
+}
+
+describe("1791364628703_fix_recurring_tasks_immutable_index migration round-trip", () => {
+  const migrationPath = path.resolve(
+    __dirname,
+    "../../database/pg-migrations/1791364628703_fix_recurring_tasks_immutable_index.js"
+  );
+  // eslint-disable-next-line @typescript-eslint/no-var-requires
+  const migration = require(migrationPath) as Migration;
+
+  it("applies up migration using immutable UTC date expression for timestamptz", async () => {
+    const statements: string[] = [];
+    await migration.up({ sql: statement => statements.push(statement) });
+    const sql = statements.join("\n");
+
+    expect(sql).toContain("DROP INDEX IF EXISTS idx_tasks_schedule_end_date_unique;");
+    expect(sql).toContain("CREATE UNIQUE INDEX idx_tasks_schedule_end_date_unique");
+    expect(sql).toContain("ON tasks (schedule_id, ((end_date AT TIME ZONE 'UTC')::DATE))");
+    expect(sql).toContain("WHERE schedule_id IS NOT NULL AND end_date IS NOT NULL;");
+  });
+
+  it("restores baseline unique index on rollback to preserve uniqueness guard", async () => {
+    const statements: string[] = [];
+    await migration.down({ sql: statement => statements.push(statement) });
+    const sql = statements.join("\n");
+
+    expect(sql).toContain("DROP INDEX IF EXISTS idx_tasks_schedule_end_date_unique;");
+    expect(sql).toContain("CREATE UNIQUE INDEX idx_tasks_schedule_end_date_unique");
+    expect(sql).toContain("ON tasks (schedule_id, end_date)");
+    expect(sql).toContain("WHERE schedule_id IS NOT NULL AND end_date IS NOT NULL;");
+  });
+
+  it("completes round-trip ensuring uniqueness protection is maintained after down", async () => {
+    const upStatements: string[] = [];
+    await migration.up({ sql: statement => upStatements.push(statement) });
+
+    const downStatements: string[] = [];
+    await migration.down({ sql: statement => downStatements.push(statement) });
+
+    const upSql = upStatements.join("\n");
+    const downSql = downStatements.join("\n");
+
+    // up creates immutable index
+    expect(upSql).toMatch(/CREATE UNIQUE INDEX idx_tasks_schedule_end_date_unique\s+ON tasks \(schedule_id, \(\(end_date AT TIME ZONE 'UTC'\)::DATE\)\)/);
+    // down restores preceding baseline index
+    expect(downSql).toMatch(/CREATE UNIQUE INDEX idx_tasks_schedule_end_date_unique\s+ON tasks \(schedule_id, end_date\)/);
+  });
+});
diff --git a/worklenz-frontend/src/components/task-management/improved-task-filters/improved-task-filters-container.tsx b/worklenz-frontend/src/components/task-management/improved-task-filters/improved-task-filters-container.tsx
index 71372ffc5..9364ca42d 100644
--- a/worklenz-frontend/src/components/task-management/improved-task-filters/improved-task-filters-container.tsx
+++ b/worklenz-frontend/src/components/task-management/improved-task-filters/improved-task-filters-container.tsx
@@ -213,7 +213,7 @@ const useFilterData = (position: 'board' | 'list'): FilterSection[] => {
           })),
           selectedValues: filterData.kanbanStatuses.map((s: any) => s.id || '').filter(Boolean),
           multiSelect: true,
-          searchable: false,
+          searchable: true,
           icon: CheckCircleOutlined,
         },
         {
@@ -227,7 +227,7 @@ const useFilterData = (position: 'board' | 'list'): FilterSection[] => {
           })),
           selectedValues: filterData.kanbanPhases,
           multiSelect: true,
-          searchable: false,
+          searchable: true,
           icon: AppstoreOutlined,
         },
         {
@@ -308,7 +308,7 @@ const useFilterData = (position: 'board' | 'list'): FilterSection[] => {
         })),
         selectedValues: filterData.selectedStatuses.map((s: any) => s.id || '').filter(Boolean),
         multiSelect: true,
-        searchable: false,
+        searchable: true,
         icon: CheckCircleOutlined,
       },
       {
@@ -322,7 +322,7 @@ const useFilterData = (position: 'board' | 'list'): FilterSection[] => {
         })),
         selectedValues: filterData.selectedPhases,
         multiSelect: true,
-        searchable: false,
+        searchable: true,
         icon: AppstoreOutlined,
       },
       {