diff --git a/scripts/qa/db_status.py b/scripts/qa/db_status.py
new file mode 100644
index 0000000..98c9c4f
--- /dev/null
+++ b/scripts/qa/db_status.py
@@ -0,0 +1,35 @@
+"""Quick DB status check."""
+import os, psycopg2, urllib.parse
+db_url = os.environ['DATABASE_URL']
+parsed = urllib.parse.urlparse(db_url)
+conn = psycopg2.connect(host=parsed.hostname, port=parsed.port or 5432, user=parsed.username, password=parsed.password, dbname=parsed.path.lstrip('/'), options="-c search_path=compliance,public")
+cur = conn.cursor()
+
+cur.execute("""
+    SELECT release_state, count(*) FROM compliance.canonical_controls
+    GROUP BY 1 ORDER BY count(*) DESC
+""")
+total = 0
+active = 0
+print("Release state distribution:")
+for row in cur.fetchall():
+    print(f"  {str(row[0]):15s} {row[1]:6d}")
+    total += row[1]
+    if row[0] not in ('duplicate', 'too_close', 'deprecated'):
+        active += row[1]
+print(f"  {'TOTAL':15s} {total:6d}")
+print(f"  {'ACTIVE':15s} {active:6d}")
+
+# Article type distribution for active controls
+cur.execute("""
+    SELECT source_citation->>'article_type', count(*)
+    FROM compliance.canonical_controls
+    WHERE release_state NOT IN ('duplicate', 'too_close', 'deprecated')
+    AND source_citation->>'article_type' IS NOT NULL
+    GROUP BY 1 ORDER BY count(*) DESC
+""")
+print(f"\nArticle types (active controls):")
+for row in cur.fetchall():
+    print(f"  {str(row[0]):12s} {row[1]:5d}")
+
+conn.close()
diff --git a/scripts/qa/preamble_dedup.py b/scripts/qa/preamble_dedup.py
new file mode 100644
index 0000000..5548373
--- /dev/null
+++ b/scripts/qa/preamble_dedup.py
@@ -0,0 +1,152 @@
+"""
+Step 4: Preamble vs. Article dedup.
+If a preamble control covers the same topic as an article control
+(same regulation, similar title), mark the preamble as duplicate.
+Article controls always take priority.
+"""
+import os
+import re
+import psycopg2
+import urllib.parse
+
+STOPWORDS = {
+    'der', 'die', 'das', 'den', 'dem', 'des', 'ein', 'eine', 'einer', 'eines',
+    'und', 'oder', 'für', 'von', 'zu', 'mit', 'auf', 'in', 'an', 'bei', 'nach',
+    'über', 'unter', 'durch', 'als', 'aus', 'zur', 'zum', 'im', 'am', 'um',
+    'ist', 'sind', 'wird', 'werden', 'hat', 'haben', 'kann', 'können',
+    'the', 'and', 'or', 'for', 'of', 'to', 'with', 'on', 'in', 'at', 'by',
+    'is', 'are', 'be', 'was', 'were', 'been', 'has', 'have', 'had',
+    'a', 'an', 'not', 'no', 'from',
+}
+
+def tokenize(title):
+    """Tokenize and remove stopwords."""
+    words = set(re.findall(r'\w+', title.lower()))
+    return words - STOPWORDS
+
+def jaccard(a, b):
+    """Jaccard similarity between two word sets."""
+    if not a or not b:
+        return 0.0
+    return len(a & b) / len(a | b)
+
+db_url = os.environ['DATABASE_URL']
+parsed = urllib.parse.urlparse(db_url)
+conn = psycopg2.connect(
+    host=parsed.hostname, port=parsed.port or 5432,
+    user=parsed.username, password=parsed.password,
+    dbname=parsed.path.lstrip('/'),
+    options="-c search_path=compliance,public"
+)
+cur = conn.cursor()
+
+# Get all active controls with article_type
+cur.execute("""
+    SELECT id, control_id, title,
+           source_citation->>'source' as source,
+           source_citation->>'article' as article,
+           source_citation->>'article_type' as article_type,
+           release_state
+    FROM compliance.canonical_controls
+    WHERE release_state NOT IN ('duplicate', 'too_close')
+    AND source_citation->>'article_type' IS NOT NULL
+    ORDER BY source_citation->>'source', control_id
+""")
+controls = cur.fetchall()
+print(f"Active controls with article_type: {len(controls)}")
+
+# Group by source
+by_source = {}
+for c in controls:
+    src = c[3] or "(null)"
+    by_source.setdefault(src, []).append(c)
+
+# For each source: find preamble controls that duplicate article controls
+total_dupes = 0
+dupe_pairs = []
+
+for source, ctrls in sorted(by_source.items(), key=lambda x: -len(x[1])):
+    articles = [c for c in ctrls if c[5] == 'article']
+    preambles = [c for c in ctrls if c[5] == 'preamble']
+    annexes = [c for c in ctrls if c[5] == 'annex']
+
+    if not preambles or not articles:
+        continue
+
+    # Precompute tokens for article controls
+    article_tokens = [(c, tokenize(c[2])) for c in articles]
+
+    source_dupes = 0
+    for p_ctrl in preambles:
+        p_tokens = tokenize(p_ctrl[2])
+        if not p_tokens:
+            continue
+
+        # Find best matching article control
+        best_match = None
+        best_score = 0
+        for a_ctrl, a_tokens in article_tokens:
+            score = jaccard(p_tokens, a_tokens)
+            if score > best_score:
+                best_score = score
+                best_match = a_ctrl
+
+        # Threshold: 0.40 similarity → likely same topic
+        if best_score >= 0.40 and best_match:
+            source_dupes += 1
+            dupe_pairs.append((p_ctrl, best_match, best_score))
+
+    if source_dupes > 0:
+        print(f"\n{source}: {source_dupes} preamble duplicates (of {len(preambles)} preambles, {len(articles)} articles)")
+        # Show first 3 pairs
+        pairs_for_source = [(p, a, s) for p, a, s in dupe_pairs if p[3] == source]
+        for p, a, score in pairs_for_source[:3]:
+            print(f"  PREAMBLE {p[1]}: {p[2][:60]}")
+            print(f"  ARTICLE  {a[1]}: {a[2][:60]}")
+            print(f"  Jaccard: {score:.2f}  ({p[4]} vs {a[4]})")
+            print()
+
+    total_dupes += source_dupes
+
+print(f"\n{'='*60}")
+print(f"SUMMARY")
+print(f"{'='*60}")
+print(f"  Total preamble controls checked: {sum(len([c for c in v if c[5]=='preamble']) for v in by_source.values())}")
+print(f"  Preamble duplicates found: {total_dupes}")
+print(f"  Unique preamble controls: {sum(len([c for c in v if c[5]=='preamble']) for v in by_source.values()) - total_dupes}")
+
+# Preview only — don't apply yet
+if dupe_pairs:
+    print(f"\n=== DRY RUN: Would mark {total_dupes} as duplicate ===")
+    # Score distribution
+    scores = [s for _, _, s in dupe_pairs]
+    print(f"  Score range: {min(scores):.2f} - {max(scores):.2f}")
+    print(f"  Score >= 0.50: {sum(1 for s in scores if s >= 0.50)}")
+    print(f"  Score 0.40-0.49: {sum(1 for s in scores if 0.40 <= s < 0.50)}")
+
+    # Ask for confirmation
+    print(f"\n  Apply? Set APPLY=1 env var to mark duplicates.")
+    if os.environ.get('APPLY') == '1':
+        print(f"\n  Applying {total_dupes} duplicate marks...")
+        applied = 0
+        for p_ctrl, a_ctrl, score in dupe_pairs:
+            cur.execute("""
+                UPDATE compliance.canonical_controls
+                SET release_state = 'duplicate',
+                    updated_at = now()
+                WHERE id = %s
+                AND release_state NOT IN ('duplicate', 'too_close')
+            """, (str(p_ctrl[0]),))
+            if cur.rowcount > 0:
+                applied += 1
+        conn.commit()
+        print(f"  Applied: {applied} marked as duplicate")
+    else:
+        # Show all pairs for review
+        print(f"\n=== All {total_dupes} pairs ===")
+        for p, a, score in sorted(dupe_pairs, key=lambda x: -x[2])[:30]:
+            print(f"  [{score:.2f}] {p[1]:10s} ({p[4]}) → {a[1]:10s} ({a[4]})")
+            print(f"         P: {p[2][:65]}")
+            print(f"         A: {a[2][:65]}")
+
+conn.close()