diff --git a/engine.py b/engine.py
index c3ad724..0cb8ddb 100644
--- a/engine.py
+++ b/engine.py
@@ -49,6 +49,9 @@ def greet(name):
 # [SEC C START] Math helpers
 def add(a, b):
     return a + b
+
+def multiply(a, b):
+    return a * b
 # SEC C filler 001
 # SEC C filler 002
 # SEC C filler 003
@@ -156,7 +159,8 @@ def compute_version():
 # [SEC E END]
 
 # [SEC F START] Flags
-FEATURE_X = False
+FEATURE_X = True
+FEATURE_Y = False
 # SEC F filler 001
 # SEC F filler 002
 # SEC F filler 003
@@ -190,8 +194,8 @@ def compute_version():
 # [SEC F END]
 
 # [SEC G START] IO helpers
-def write_file(p, text, mode="w"):
-    open(p, mode).write(text)
+def write_file(p, text):
+    open(p, "w").write(text)
 # SEC G filler 001
 # SEC G filler 002
 # SEC G filler 003
@@ -226,7 +230,7 @@ def write_file(p, text, mode="w"):
 
 # [SEC H START] Main
 if __name__ == "__main__":
-    print(greet("MAIN"))
+    print(greet("world"))
 # SEC H filler 001
 # SEC H filler 002
 # SEC H filler 003
diff --git a/handbook.md b/handbook.md
index 726910c..cbc5bf8 100644
--- a/handbook.md
+++ b/handbook.md
@@ -77,6 +77,8 @@ version: 1
 - main is protected
 - feature branches from main
 - rebase before merge
+- PRs must reference a ticket
+- Merge via squash
 <!-- Ch3 filler 001 -->
 <!-- Ch3 filler 002 -->
 <!-- Ch3 filler 003 -->
@@ -144,10 +146,10 @@ version: 1
 <!-- Ch4 filler 030 -->
 
 # Chapter 5: Release Process
-- bump version (semver)
-- tag release
+- version bump via tool
+- tag &amp; sign release
 - publish artifacts
-- smoke test in staging
+- canary 10% for 1h
 <!-- Ch5 filler 001 -->
 <!-- Ch5 filler 002 -->
 <!-- Ch5 filler 003 -->
@@ -181,6 +183,8 @@ version: 1
 
 # Chapter 6: Incident Response
 - SEV1 page immediately
+- RCA start within 48h
+- Postmortem by end of week
 - Initial RCA within 24h
 - Full postmortem within 72h
 <!-- Ch6 filler 001 -->
@@ -251,7 +255,6 @@ version: 1
 # Chapter 8: FAQ
 - Q: Who owns releases? A: Dev Infra
 - Q: What’s the SLA? A: 99.9%
-- Q: Do we support LTS? A: 12 months
 <!-- Ch8 filler 001 -->
 <!-- Ch8 filler 002 -->
 <!-- Ch8 filler 003 -->
diff --git a/pipeline.sql b/pipeline.sql
index 6711a85..c034787 100644
--- a/pipeline.sql
+++ b/pipeline.sql
@@ -2,8 +2,6 @@
 
 -- [STAGE 1 START] prepare users
 CREATE TEMP TABLE t_users AS
--- main adds constraint
--- (simulated) ALTER TABLE t_users ADD PRIMARY KEY (id);
 SELECT id, name, active
 FROM users
 WHERE deleted = false;
@@ -43,8 +41,8 @@ WHERE deleted = false;
 CREATE TEMP TABLE t_active AS
 SELECT id, name
 FROM t_users
-WHERE active = true AND name IS NOT NULL
-LIMIT 100;
+WHERE active = true AND name <> ''
+ORDER BY name;
 -- S2 filler 001
 -- S2 filler 002
 -- S2 filler 003
@@ -116,9 +114,10 @@ LEFT JOIN purchases p ON p.user_id = a.id;
 
 -- [STAGE 4 START] aggregate revenue
 CREATE TEMP TABLE t_rev AS
-SELECT id, SUM(amount * 1.05) AS revenue  -- main applies uplift
+SELECT id, SUM(amount) AS revenue           -- feature keeps raw sum
 FROM t_join
-GROUP BY id;
+GROUP BY id
+HAVING SUM(amount) > 0;                     -- feature adds HAVING
 -- S4 filler 001
 -- S4 filler 002
 -- S4 filler 003
@@ -152,11 +151,11 @@ GROUP BY id;
 -- [STAGE 4 END]
 
 -- [STAGE 5 START] write outputs
-INSERT INTO reporting.users_daily (id, name, revenue, dt)
-SELECT j.id, j.name, r.revenue, CURRENT_DATE
+INSERT INTO reporting.users_daily (id, name, revenue, yyyymm)
+SELECT j.id, j.name, r.revenue, TO_CHAR(CURRENT_DATE, 'YYYYMM')
 FROM t_join j
 JOIN t_rev r USING (id);
--- main keeps dt as DATE partition
+-- feature writes to yyyymm column instead of dt
 -- S5 filler 001
 -- S5 filler 002
 -- S5 filler 003
@@ -190,7 +189,7 @@ JOIN t_rev r USING (id);
 -- [STAGE 5 END]
 
 -- [STAGE 6 START] finalize
-VACUUM ANALYZE;
+ANALYZE VERBOSE;  -- feature alternative finalization
 -- S6 filler 001
 -- S6 filler 002
 -- S6 filler 003