diff --git a/docker/unified/entrypoint.sh b/docker/unified/entrypoint.sh
index e0a65d7..76fb8c2 100644
--- a/docker/unified/entrypoint.sh
+++ b/docker/unified/entrypoint.sh
@@ -403,12 +403,26 @@ echo "🔄 Running Prisma migrations..."
 cd /app
 su - node -c "cd /app && DATABASE_URL='$DATABASE_URL' npx prisma db push --skip-generate --accept-data-loss" || echo "⚠️  Migrations may have failed, continuing..."
 
-# Run data migrations (idempotent SQL scripts that prisma db push doesn't handle)
+# Run data migrations (run-once SQL scripts tracked in _data_migrations table)
 echo "🔄 Running data migrations..."
+
 for sql_file in /app/prisma/data-migrations/*.sql; do
     if [ -f "$sql_file" ]; then
-        echo "   Running $(basename "$sql_file")..."
-        su - node -c "cd /app && DATABASE_URL='$DATABASE_URL' npx prisma db execute --schema prisma/schema.prisma --file '$sql_file'" || echo "⚠️  Data migration $(basename "$sql_file") may have failed, continuing..."
+        migration_name=$(basename "$sql_file")
+
+        already_run=$(psql "$DATABASE_URL" -tA -c "SELECT 1 FROM _data_migrations WHERE name = '$migration_name' LIMIT 1;")
+        if [ "$already_run" = "1" ]; then
+            echo "   Skipping $migration_name (already executed)"
+            continue
+        fi
+
+        echo "   Running $migration_name..."
+        if su - node -c "cd /app && DATABASE_URL='$DATABASE_URL' npx prisma db execute --schema prisma/schema.prisma --file '$sql_file'"; then
+            psql "$DATABASE_URL" -c "INSERT INTO _data_migrations (name) VALUES ('$migration_name');"
+            echo "   ✅ $migration_name completed"
+        else
+            echo "⚠️  Data migration $migration_name failed, will retry on next start"
+        fi
     fi
 done
 
diff --git a/prisma/data-migrations/reset-works-table.sql b/prisma/data-migrations/reset-works-table.sql
new file mode 100644
index 0000000..1bbd29f
--- /dev/null
+++ b/prisma/data-migrations/reset-works-table.sql
@@ -0,0 +1,7 @@
+-- Reset works table to fix incorrect dedup groupings (v1.1.2)
+-- Books with "Series: Title" naming (e.g. "Eden's Gate: The Reborn" vs
+-- "Eden's Gate: The Spartan") were incorrectly merged into the same work
+-- because subtitle stripping collapsed them to the same base title.
+-- The works table auto-rebuilds from dedup logic as users browse.
+DELETE FROM work_asins;
+DELETE FROM works;
diff --git a/prisma/schema.prisma b/prisma/schema.prisma
index 04ec930..7234838 100644
--- a/prisma/schema.prisma
+++ b/prisma/schema.prisma
@@ -718,3 +718,15 @@ model AudibleCacheCategory {
   @@index([categoryId, rank])
   @@map("audible_cache_categories")
 }
+
+// ============================================================================
+// DATA MIGRATION TRACKING
+// Tracks which data migration SQL scripts have been executed (run-once).
+// ============================================================================
+
+model DataMigration {
+  name       String   @id
+  executedAt DateTime @default(now()) @map("executed_at")
+
+  @@map("_data_migrations")
+}
diff --git a/src/lib/utils/deduplicate-audiobooks.ts b/src/lib/utils/deduplicate-audiobooks.ts
index 1cfe6f2..cbaf773 100644
--- a/src/lib/utils/deduplicate-audiobooks.ts
+++ b/src/lib/utils/deduplicate-audiobooks.ts
@@ -19,7 +19,7 @@ import type { AudibleAudiobook } from '../integrations/audible.service';
 /** Patterns in parentheses or brackets to strip (edition markers, format labels) */
 const EDITION_PAREN_RE = /[([][^)\]]*?(?:unabridged|abridged|edition|remaster(?:ed)?|anniversary|complete|original|version|narrat(?:ed|or)?|audio(?:book)?|full cast|dramatiz(?:ed|ation))[^)\]]*[)\]]/gi;
 
-/** Trailing subtitle after colon or long dash */
+/** Trailing subtitle after colon or long dash (used for extraction, not blind stripping) */
 const SUBTITLE_RE = /\s*[:]\s+.+$/;
 const LONG_DASH_SUBTITLE_RE = /\s+[-\u2013\u2014]\s+.+$/;
 
@@ -44,6 +44,44 @@ export function normalizeTitle(title: string): string {
   return t.replace(/\s+/g, ' ').trim();
 }
 
+/**
+ * Extract the subtitle portion from a title (part after colon or long dash).
+ * Returns empty string if no subtitle found.
+ * Used to prevent false dedup of series books like "Series: Book A" vs "Series: Book B".
+ */
+export function extractSubtitle(title: string): string {
+  let t = title.toLowerCase();
+  // Remove parenthesized/bracketed edition markers first (same as normalizeTitle)
+  t = t.replace(EDITION_PAREN_RE, '');
+  // Remove trailing descriptors
+  t = t.replace(TRAILING_DESCRIPTOR_RE, '');
+  t = t.replace(/\s+/g, ' ').trim();
+
+  // Try colon subtitle
+  const colonMatch = t.match(/\s*[:]\s+(.+)$/);
+  if (colonMatch) return colonMatch[1].trim();
+
+  // Try long dash subtitle
+  const dashMatch = t.match(/\s+[-\u2013\u2014]\s+(.+)$/);
+  if (dashMatch) return dashMatch[1].trim();
+
+  return '';
+}
+
+/**
+ * Check if two titles' subtitles are compatible for dedup purposes.
+ * - Both have no subtitle → compatible
+ * - One has a subtitle, other doesn't → compatible (re-listing with/without subtitle)
+ * - Both have the SAME subtitle → compatible
+ * - Both have DIFFERENT subtitles → NOT compatible (different books, e.g. series entries)
+ */
+function areSubtitlesCompatible(titleA: string, titleB: string): boolean {
+  const subA = extractSubtitle(titleA);
+  const subB = extractSubtitle(titleB);
+  if (!subA || !subB) return true; // one or both missing → compatible
+  return subA === subB;
+}
+
 /** Normalize narrator for comparison. Sorts individual names so order doesn't matter. */
 function normalizeNarrator(narrator?: string): string {
   const raw = (narrator || '').toLowerCase().trim();
@@ -152,16 +190,20 @@ export function deduplicateAndCollectGroups(books: AudibleAudiobook[]): Deduplic
       continue;
     }
 
-    // Within a title+narrator group, further split by duration compatibility.
-    // Build sub-groups where all members are duration-compatible with the
-    // representative (first member). A book joins the first compatible sub-group.
+    // Within a title+narrator group, further split by duration AND subtitle
+    // compatibility. Build sub-groups where all members are compatible with
+    // the representative (first member). A book joins the first compatible sub-group.
+    // This prevents false dedup of series entries like "Series: Book A" vs "Series: Book B".
     const subGroups: AudibleAudiobook[][] = [];
 
     for (const book of group) {
       let placed = false;
       for (const sg of subGroups) {
-        // Check compatibility against the representative (first member)
-        if (areDurationsCompatible(sg[0].durationMinutes, book.durationMinutes)) {
+        // Check both duration and subtitle compatibility against the representative
+        if (
+          areDurationsCompatible(sg[0].durationMinutes, book.durationMinutes) &&
+          areSubtitlesCompatible(sg[0].title, book.title)
+        ) {
           sg.push(book);
           placed = true;
           break;
diff --git a/tests/utils/deduplicate-audiobooks.test.ts b/tests/utils/deduplicate-audiobooks.test.ts
index a535e15..a84d5ed 100644
--- a/tests/utils/deduplicate-audiobooks.test.ts
+++ b/tests/utils/deduplicate-audiobooks.test.ts
@@ -8,6 +8,7 @@ import {
   deduplicateAudiobooks,
   deduplicateAndCollectGroups,
   normalizeTitle,
+  extractSubtitle,
   areDurationsCompatible,
 } from '@/lib/utils/deduplicate-audiobooks';
 import type { AudibleAudiobook } from '@/lib/integrations/audible.service';
@@ -92,6 +93,32 @@ describe('normalizeTitle', () => {
   });
 });
 
+// ---------------------------------------------------------------------------
+// extractSubtitle
+// ---------------------------------------------------------------------------
+
+describe('extractSubtitle', () => {
+  it('extracts subtitle after colon', () => {
+    expect(extractSubtitle('Eden\'s Gate: The Reborn')).toBe('the reborn');
+  });
+
+  it('extracts subtitle after long dash', () => {
+    expect(extractSubtitle('Eden\'s Gate \u2014 The Reborn')).toBe('the reborn');
+  });
+
+  it('returns empty for title without subtitle', () => {
+    expect(extractSubtitle('The Black Prism')).toBe('');
+  });
+
+  it('strips edition markers before extracting', () => {
+    expect(extractSubtitle('The Hobbit (Unabridged): Extended')).toBe('extended');
+  });
+
+  it('returns empty string for empty input', () => {
+    expect(extractSubtitle('')).toBe('');
+  });
+});
+
 // ---------------------------------------------------------------------------
 // areDurationsCompatible
 // ---------------------------------------------------------------------------
@@ -302,6 +329,27 @@ describe('deduplicateAudiobooks', () => {
     expect(deduplicateAudiobooks(books)).toHaveLength(1);
   });
 
+  it('does NOT collapse series entries with different subtitles (Eden\'s Gate bug)', () => {
+    // Series format: "Series Name: Book Title" — different books, NOT duplicates
+    const books = [
+      makeBook({ asin: 'A1', title: 'Eden\'s Gate: The Reborn', author: 'Edward Brody', narrator: 'Pavi Proczko', durationMinutes: 510 }),
+      makeBook({ asin: 'A2', title: 'Eden\'s Gate: The Spartan', author: 'Edward Brody', narrator: 'Pavi Proczko', durationMinutes: 540 }),
+      makeBook({ asin: 'A3', title: 'Eden\'s Gate: The Sapper', author: 'Edward Brody', narrator: 'Pavi Proczko', durationMinutes: 600 }),
+    ];
+    const result = deduplicateAudiobooks(books);
+    expect(result).toHaveLength(3); // All 3 are different books!
+  });
+
+  it('still collapses when one has subtitle and other does not', () => {
+    // Same book re-listed: "The Black Prism: Lightbringer, Book 1" vs "The Black Prism"
+    const books = [
+      makeBook({ asin: 'A1', title: 'The Black Prism: Lightbringer, Book 1', author: 'Brent Weeks', narrator: 'Simon Vance', durationMinutes: 1260 }),
+      makeBook({ asin: 'A2', title: 'The Black Prism', author: 'Brent Weeks', narrator: 'Simon Vance', durationMinutes: 1262 }),
+    ];
+    const result = deduplicateAudiobooks(books);
+    expect(result).toHaveLength(1);
+  });
+
   it('does not collapse empty-narrator with named narrator', () => {
     const books = [
       makeBook({ asin: 'A1', title: 'Test Book', author: 'Auth', narrator: undefined, durationMinutes: 300 }),