diff --git a/migrations/0001_auth.sql b/migrations/0001_auth.sql
index 798ed15..8af7180 100644
--- a/migrations/0001_auth.sql
+++ b/migrations/0001_auth.sql
@@ -1,14 +1,14 @@
 -- Authentication and authorisation tables
 
 CREATE TABLE users (
-    id INTEGER PRIMARY KEY,
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
     username TEXT NOT NULL UNIQUE,
     uuid TEXT,
     created_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now'))
 );
 
 CREATE TABLE tokens (
-    id INTEGER PRIMARY KEY,
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
     user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
     token_hash TEXT NOT NULL UNIQUE,
     name TEXT NOT NULL,
@@ -20,7 +20,7 @@ CREATE INDEX idx_tokens_user_id ON tokens(user_id);
 CREATE INDEX idx_tokens_token_hash ON tokens(token_hash);
 
 CREATE TABLE sessions (
-    id INTEGER PRIMARY KEY,
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
     user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
     session_token_hash TEXT NOT NULL,
     created_at TEXT NOT NULL,
@@ -31,7 +31,7 @@ CREATE INDEX idx_sessions_user_id ON sessions(user_id);
 CREATE INDEX idx_sessions_expires_at ON sessions(expires_at);
 
 CREATE TABLE passkey_credentials (
-    id INTEGER PRIMARY KEY,
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
     user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
     credential_json TEXT NOT NULL,
     name TEXT NOT NULL DEFAULT 'default',
@@ -41,7 +41,7 @@ CREATE TABLE passkey_credentials (
 CREATE INDEX idx_passkey_credentials_user_id ON passkey_credentials(user_id);
 
 CREATE TABLE registration_tokens (
-    id INTEGER PRIMARY KEY,
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
     token_hash TEXT NOT NULL UNIQUE,
     created_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now')),
     expires_at TEXT NOT NULL,
diff --git a/migrations/0002_coffee.sql b/migrations/0002_coffee.sql
index 2921865..7e447b5 100644
--- a/migrations/0002_coffee.sql
+++ b/migrations/0002_coffee.sql
@@ -1,7 +1,7 @@
 -- Coffee supply chain and equipment tables
 
 CREATE TABLE roasters (
-    id INTEGER PRIMARY KEY,
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
     name TEXT NOT NULL,
     country TEXT NOT NULL,
     city TEXT,
@@ -12,7 +12,7 @@ CREATE TABLE roasters (
 CREATE UNIQUE INDEX idx_roasters_slug ON roasters(slug);
 
 CREATE TABLE roasts (
-    id INTEGER PRIMARY KEY,
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
     roaster_id INTEGER NOT NULL REFERENCES roasters(id) ON DELETE CASCADE,
     name TEXT NOT NULL,
     origin TEXT,
@@ -27,7 +27,7 @@ CREATE INDEX idx_roasts_roaster_id ON roasts(roaster_id);
 CREATE UNIQUE INDEX idx_roasts_roaster_slug ON roasts(roaster_id, slug);
 
 CREATE TABLE bags (
-    id INTEGER PRIMARY KEY,
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
     roast_id INTEGER NOT NULL REFERENCES roasts(id) ON DELETE CASCADE,
     roast_date TEXT,
     amount REAL NOT NULL,
@@ -41,7 +41,7 @@ CREATE INDEX idx_bags_roast_id ON bags(roast_id);
 CREATE INDEX idx_bags_closed ON bags(closed);
 
 CREATE TABLE gear (
-    id INTEGER PRIMARY KEY,
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
     category TEXT NOT NULL CHECK (category IN ('grinder', 'brewer', 'filter_paper')),
     make TEXT NOT NULL,
     model TEXT NOT NULL,
diff --git a/migrations/0003_activities.sql b/migrations/0003_activities.sql
index 9a5c9df..8e497cf 100644
--- a/migrations/0003_activities.sql
+++ b/migrations/0003_activities.sql
@@ -1,7 +1,7 @@
 -- Brew, cafe, and cup tables
 
 CREATE TABLE brews (
-    id INTEGER PRIMARY KEY,
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
     bag_id INTEGER NOT NULL REFERENCES bags(id) ON DELETE CASCADE,
     coffee_weight REAL NOT NULL,
     grinder_id INTEGER NOT NULL REFERENCES gear(id) ON DELETE RESTRICT,
@@ -18,7 +18,7 @@ CREATE INDEX idx_brews_bag_id ON brews(bag_id);
 CREATE INDEX idx_brews_created_at ON brews(created_at DESC);
 
 CREATE TABLE cafes (
-    id INTEGER PRIMARY KEY,
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
     name TEXT NOT NULL,
     slug TEXT NOT NULL,
     city TEXT NOT NULL,
@@ -32,7 +32,7 @@ CREATE TABLE cafes (
 CREATE UNIQUE INDEX idx_cafes_slug ON cafes(slug);
 
 CREATE TABLE cups (
-    id INTEGER PRIMARY KEY,
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
     roast_id INTEGER NOT NULL REFERENCES roasts(id) ON DELETE RESTRICT,
     cafe_id INTEGER NOT NULL REFERENCES cafes(id) ON DELETE RESTRICT,
     created_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now')),
diff --git a/migrations/0004_timeline_and_usage.sql b/migrations/0004_timeline_and_usage.sql
index 4cd4930..187fb3a 100644
--- a/migrations/0004_timeline_and_usage.sql
+++ b/migrations/0004_timeline_and_usage.sql
@@ -1,7 +1,7 @@
 -- Timeline events and AI usage tracking
 
 CREATE TABLE timeline_events (
-    id INTEGER PRIMARY KEY,
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
     entity_type TEXT NOT NULL CHECK (entity_type IN ('roaster', 'roast', 'bag', 'gear', 'brew', 'cafe', 'cup')),
     entity_id INTEGER NOT NULL,
     action TEXT NOT NULL,
@@ -17,7 +17,7 @@ CREATE INDEX idx_timeline_events_entity ON timeline_events(entity_type, entity_i
 CREATE INDEX idx_timeline_events_occurred_at ON timeline_events(occurred_at DESC);
 
 CREATE TABLE ai_usage (
-    id INTEGER PRIMARY KEY,
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
     user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
     model TEXT NOT NULL,
     endpoint TEXT NOT NULL,