diff --git a/pgpm/constructive-platform-seed/constructive-platform-seed.control b/pgpm/constructive-platform-seed/constructive-platform-seed.control
new file mode 100644
index 00000000..126738ec
--- /dev/null
+++ b/pgpm/constructive-platform-seed/constructive-platform-seed.control
@@ -0,0 +1,7 @@
+# constructive-platform-seed extension
+comment = 'Platform metadata seed: database, schemas, compute API, domain, and site'
+default_version = '0.1.0'
+module_pathname = '$libdir/constructive-platform-seed'
+requires = 'plpgsql,metaschema-schema,services'
+relocatable = false
+superuser = false
diff --git a/pgpm/constructive-platform-seed/deploy/fixtures/seed_compute_api.sql b/pgpm/constructive-platform-seed/deploy/fixtures/seed_compute_api.sql
new file mode 100644
index 00000000..a60558b7
--- /dev/null
+++ b/pgpm/constructive-platform-seed/deploy/fixtures/seed_compute_api.sql
@@ -0,0 +1,35 @@
+-- Deploy: fixtures/seed_compute_api
+-- made with <3 @ constructive.io
+
+-- requires: fixtures/seed_schemas
+-- requires: services:schemas/services_public/tables/apis/table
+-- requires: services:schemas/services_public/tables/api_schemas/table
+
+BEGIN;
+
+-- Create the compute API (mirrors how constructive-db provisions per-database APIs).
+INSERT INTO services_public.apis (database_id, name, role_name, anon_role, is_public)
+VALUES ('00000000-0000-0000-0000-000000000000', 'compute', 'authenticated', 'anonymous', true)
+ON CONFLICT (database_id, name) DO NOTHING;
+
+-- Link all public schemas to the compute API.
+INSERT INTO services_public.api_schemas (database_id, api_id, schema_id)
+SELECT
+  '00000000-0000-0000-0000-000000000000',
+  a.id,
+  s.id
+FROM services_public.apis a
+CROSS JOIN metaschema_public.schema s
+WHERE a.database_id = '00000000-0000-0000-0000-000000000000'
+  AND a.name = 'compute'
+  AND s.database_id = '00000000-0000-0000-0000-000000000000'
+  AND s.schema_name IN (
+    'constructive_infra_public',
+    'constructive_store_public',
+    'constructive_objects_public',
+    'constructive_fbp_public',
+    'constructive_storage_public'
+  )
+ON CONFLICT (api_id, schema_id) DO NOTHING;
+
+COMMIT;
diff --git a/pgpm/constructive-platform-seed/deploy/fixtures/seed_database.sql b/pgpm/constructive-platform-seed/deploy/fixtures/seed_database.sql
new file mode 100644
index 00000000..350ad462
--- /dev/null
+++ b/pgpm/constructive-platform-seed/deploy/fixtures/seed_database.sql
@@ -0,0 +1,16 @@
+-- Deploy: fixtures/seed_database
+-- made with <3 @ constructive.io
+
+-- requires: metaschema-schema:schemas/metaschema_public/tables/database/table
+
+BEGIN;
+
+INSERT INTO metaschema_public.database (id, name, schema_hash)
+VALUES (
+  '00000000-0000-0000-0000-000000000000',
+  current_database(),
+  'constructive-functions-local'
+)
+ON CONFLICT (schema_hash) DO NOTHING;
+
+COMMIT;
diff --git a/pgpm/constructive-platform-seed/deploy/fixtures/seed_domain.sql b/pgpm/constructive-platform-seed/deploy/fixtures/seed_domain.sql
new file mode 100644
index 00000000..c23f2987
--- /dev/null
+++ b/pgpm/constructive-platform-seed/deploy/fixtures/seed_domain.sql
@@ -0,0 +1,22 @@
+-- Deploy: fixtures/seed_domain
+-- made with <3 @ constructive.io
+
+-- requires: fixtures/seed_compute_api
+-- requires: services:schemas/services_public/tables/domains/table
+
+BEGIN;
+
+-- Create a domain routing to the compute API.
+-- In production, the upstream provisioning system sets real subdomain/domain values.
+INSERT INTO services_public.domains (database_id, api_id, subdomain, domain)
+SELECT
+  '00000000-0000-0000-0000-000000000000',
+  a.id,
+  'compute',
+  'localhost'
+FROM services_public.apis a
+WHERE a.database_id = '00000000-0000-0000-0000-000000000000'
+  AND a.name = 'compute'
+ON CONFLICT (subdomain, domain) DO NOTHING;
+
+COMMIT;
diff --git a/pgpm/constructive-platform-seed/deploy/fixtures/seed_schemas.sql b/pgpm/constructive-platform-seed/deploy/fixtures/seed_schemas.sql
new file mode 100644
index 00000000..e9651efa
--- /dev/null
+++ b/pgpm/constructive-platform-seed/deploy/fixtures/seed_schemas.sql
@@ -0,0 +1,21 @@
+-- Deploy: fixtures/seed_schemas
+-- made with <3 @ constructive.io
+
+-- requires: fixtures/seed_database
+-- requires: metaschema-schema:schemas/metaschema_public/tables/schema/table
+
+BEGIN;
+
+-- Register all module public schemas in metaschema so the API can resolve them.
+-- Uses the well-known database ID from seed_database.
+
+INSERT INTO metaschema_public.schema (database_id, name, schema_name, category, is_public)
+VALUES
+  ('00000000-0000-0000-0000-000000000000', 'constructive_infra_public', 'constructive_infra_public', 'app', true),
+  ('00000000-0000-0000-0000-000000000000', 'constructive_store_public', 'constructive_store_public', 'app', true),
+  ('00000000-0000-0000-0000-000000000000', 'constructive_objects_public', 'constructive_objects_public', 'app', true),
+  ('00000000-0000-0000-0000-000000000000', 'constructive_fbp_public', 'constructive_fbp_public', 'app', true),
+  ('00000000-0000-0000-0000-000000000000', 'constructive_storage_public', 'constructive_storage_public', 'app', true)
+ON CONFLICT (schema_name) DO NOTHING;
+
+COMMIT;
diff --git a/pgpm/constructive-platform-seed/deploy/fixtures/seed_site.sql b/pgpm/constructive-platform-seed/deploy/fixtures/seed_site.sql
new file mode 100644
index 00000000..41c6cfc3
--- /dev/null
+++ b/pgpm/constructive-platform-seed/deploy/fixtures/seed_site.sql
@@ -0,0 +1,30 @@
+-- Deploy: fixtures/seed_site
+-- made with <3 @ constructive.io
+
+-- requires: fixtures/seed_database
+-- requires: services:schemas/services_public/tables/sites/table
+-- requires: services:schemas/services_public/tables/domains/table
+
+BEGIN;
+
+-- Create a platform site for branding/metadata resolution.
+INSERT INTO services_public.sites (database_id, title, description)
+VALUES (
+  '00000000-0000-0000-0000-000000000000',
+  'Constructive Functions',
+  'Serverless compute platform'
+)
+ON CONFLICT DO NOTHING;
+
+-- Create a site domain (site-level routing, separate from the API domain).
+INSERT INTO services_public.domains (database_id, site_id, subdomain, domain)
+SELECT
+  '00000000-0000-0000-0000-000000000000',
+  s.id,
+  'app',
+  'localhost'
+FROM services_public.sites s
+WHERE s.database_id = '00000000-0000-0000-0000-000000000000'
+ON CONFLICT (subdomain, domain) DO NOTHING;
+
+COMMIT;
diff --git a/pgpm/constructive-platform-seed/pgpm.plan b/pgpm/constructive-platform-seed/pgpm.plan
new file mode 100644
index 00000000..7d621010
--- /dev/null
+++ b/pgpm/constructive-platform-seed/pgpm.plan
@@ -0,0 +1,9 @@
+%syntax-version=1.0.0
+%project=constructive-platform-seed
+%uri=constructive-platform-seed
+
+fixtures/seed_database [metaschema-schema:schemas/metaschema_public/tables/database/table] 2026-06-08T05:00:00Z Constructive <developers@constructive.io> # seed platform database row
+fixtures/seed_schemas [fixtures/seed_database metaschema-schema:schemas/metaschema_public/tables/schema/table] 2026-06-08T05:00:00Z Constructive <developers@constructive.io> # register public schemas in metaschema
+fixtures/seed_compute_api [fixtures/seed_schemas services:schemas/services_public/tables/apis/table services:schemas/services_public/tables/api_schemas/table] 2026-06-08T05:00:00Z Constructive <developers@constructive.io> # create compute API and link schemas
+fixtures/seed_domain [fixtures/seed_compute_api services:schemas/services_public/tables/domains/table] 2026-06-08T05:00:00Z Constructive <developers@constructive.io> # create compute domain
+fixtures/seed_site [fixtures/seed_database services:schemas/services_public/tables/sites/table services:schemas/services_public/tables/domains/table] 2026-06-08T05:00:00Z Constructive <developers@constructive.io> # create platform site and site domain
diff --git a/pgpm/constructive-platform-seed/revert/fixtures/seed_compute_api.sql b/pgpm/constructive-platform-seed/revert/fixtures/seed_compute_api.sql
new file mode 100644
index 00000000..ecd7eca0
--- /dev/null
+++ b/pgpm/constructive-platform-seed/revert/fixtures/seed_compute_api.sql
@@ -0,0 +1,17 @@
+-- Revert: fixtures/seed_compute_api
+
+BEGIN;
+
+DELETE FROM services_public.api_schemas
+WHERE database_id = '00000000-0000-0000-0000-000000000000'
+  AND api_id IN (
+    SELECT id FROM services_public.apis
+    WHERE database_id = '00000000-0000-0000-0000-000000000000'
+      AND name = 'compute'
+  );
+
+DELETE FROM services_public.apis
+WHERE database_id = '00000000-0000-0000-0000-000000000000'
+  AND name = 'compute';
+
+COMMIT;
diff --git a/pgpm/constructive-platform-seed/revert/fixtures/seed_database.sql b/pgpm/constructive-platform-seed/revert/fixtures/seed_database.sql
new file mode 100644
index 00000000..c272a60e
--- /dev/null
+++ b/pgpm/constructive-platform-seed/revert/fixtures/seed_database.sql
@@ -0,0 +1,8 @@
+-- Revert: fixtures/seed_database
+
+BEGIN;
+
+DELETE FROM metaschema_public.database
+WHERE id = '00000000-0000-0000-0000-000000000000';
+
+COMMIT;
diff --git a/pgpm/constructive-platform-seed/revert/fixtures/seed_domain.sql b/pgpm/constructive-platform-seed/revert/fixtures/seed_domain.sql
new file mode 100644
index 00000000..90d844bb
--- /dev/null
+++ b/pgpm/constructive-platform-seed/revert/fixtures/seed_domain.sql
@@ -0,0 +1,8 @@
+-- Revert: fixtures/seed_domain
+
+BEGIN;
+
+DELETE FROM services_public.domains
+WHERE subdomain = 'compute' AND domain = 'localhost';
+
+COMMIT;
diff --git a/pgpm/constructive-platform-seed/revert/fixtures/seed_schemas.sql b/pgpm/constructive-platform-seed/revert/fixtures/seed_schemas.sql
new file mode 100644
index 00000000..5412679f
--- /dev/null
+++ b/pgpm/constructive-platform-seed/revert/fixtures/seed_schemas.sql
@@ -0,0 +1,15 @@
+-- Revert: fixtures/seed_schemas
+
+BEGIN;
+
+DELETE FROM metaschema_public.schema
+WHERE database_id = '00000000-0000-0000-0000-000000000000'
+  AND schema_name IN (
+    'constructive_infra_public',
+    'constructive_store_public',
+    'constructive_objects_public',
+    'constructive_fbp_public',
+    'constructive_storage_public'
+  );
+
+COMMIT;
diff --git a/pgpm/constructive-platform-seed/revert/fixtures/seed_site.sql b/pgpm/constructive-platform-seed/revert/fixtures/seed_site.sql
new file mode 100644
index 00000000..03ffc86c
--- /dev/null
+++ b/pgpm/constructive-platform-seed/revert/fixtures/seed_site.sql
@@ -0,0 +1,11 @@
+-- Revert: fixtures/seed_site
+
+BEGIN;
+
+DELETE FROM services_public.domains
+WHERE subdomain = 'app' AND domain = 'localhost';
+
+DELETE FROM services_public.sites
+WHERE database_id = '00000000-0000-0000-0000-000000000000';
+
+COMMIT;
diff --git a/pgpm/constructive-platform-seed/verify/fixtures/seed_compute_api.sql b/pgpm/constructive-platform-seed/verify/fixtures/seed_compute_api.sql
new file mode 100644
index 00000000..cc5e30d3
--- /dev/null
+++ b/pgpm/constructive-platform-seed/verify/fixtures/seed_compute_api.sql
@@ -0,0 +1,16 @@
+-- Verify: fixtures/seed_compute_api
+
+BEGIN;
+
+SELECT a.id, a.name, a.role_name, a.anon_role, a.is_public
+FROM services_public.apis a
+WHERE a.database_id = '00000000-0000-0000-0000-000000000000'
+  AND a.name = 'compute';
+
+SELECT aps.id, aps.api_id, aps.schema_id
+FROM services_public.api_schemas aps
+JOIN services_public.apis a ON a.id = aps.api_id
+WHERE a.database_id = '00000000-0000-0000-0000-000000000000'
+  AND a.name = 'compute';
+
+ROLLBACK;
diff --git a/pgpm/constructive-platform-seed/verify/fixtures/seed_database.sql b/pgpm/constructive-platform-seed/verify/fixtures/seed_database.sql
new file mode 100644
index 00000000..d638caa7
--- /dev/null
+++ b/pgpm/constructive-platform-seed/verify/fixtures/seed_database.sql
@@ -0,0 +1,9 @@
+-- Verify: fixtures/seed_database
+
+BEGIN;
+
+SELECT id, name, schema_hash
+FROM metaschema_public.database
+WHERE id = '00000000-0000-0000-0000-000000000000';
+
+ROLLBACK;
diff --git a/pgpm/constructive-platform-seed/verify/fixtures/seed_domain.sql b/pgpm/constructive-platform-seed/verify/fixtures/seed_domain.sql
new file mode 100644
index 00000000..d19fcca4
--- /dev/null
+++ b/pgpm/constructive-platform-seed/verify/fixtures/seed_domain.sql
@@ -0,0 +1,9 @@
+-- Verify: fixtures/seed_domain
+
+BEGIN;
+
+SELECT d.id, d.database_id, d.api_id, d.subdomain, d.domain
+FROM services_public.domains d
+WHERE d.subdomain = 'compute' AND d.domain = 'localhost';
+
+ROLLBACK;
diff --git a/pgpm/constructive-platform-seed/verify/fixtures/seed_schemas.sql b/pgpm/constructive-platform-seed/verify/fixtures/seed_schemas.sql
new file mode 100644
index 00000000..416b028e
--- /dev/null
+++ b/pgpm/constructive-platform-seed/verify/fixtures/seed_schemas.sql
@@ -0,0 +1,16 @@
+-- Verify: fixtures/seed_schemas
+
+BEGIN;
+
+SELECT id, database_id, name, schema_name
+FROM metaschema_public.schema
+WHERE database_id = '00000000-0000-0000-0000-000000000000'
+  AND schema_name IN (
+    'constructive_infra_public',
+    'constructive_store_public',
+    'constructive_objects_public',
+    'constructive_fbp_public',
+    'constructive_storage_public'
+  );
+
+ROLLBACK;
diff --git a/pgpm/constructive-platform-seed/verify/fixtures/seed_site.sql b/pgpm/constructive-platform-seed/verify/fixtures/seed_site.sql
new file mode 100644
index 00000000..91745293
--- /dev/null
+++ b/pgpm/constructive-platform-seed/verify/fixtures/seed_site.sql
@@ -0,0 +1,13 @@
+-- Verify: fixtures/seed_site
+
+BEGIN;
+
+SELECT s.id, s.database_id, s.title, s.description
+FROM services_public.sites s
+WHERE s.database_id = '00000000-0000-0000-0000-000000000000';
+
+SELECT d.id, d.site_id, d.subdomain, d.domain
+FROM services_public.domains d
+WHERE d.subdomain = 'app' AND d.domain = 'localhost';
+
+ROLLBACK;
diff --git a/scripts/up.sh b/scripts/up.sh
index 83148634..ed460103 100755
--- a/scripts/up.sh
+++ b/scripts/up.sh
@@ -144,9 +144,37 @@ done
 
 rm -f "$DEPLOY_LOG"
 
-# ─── Step 5: Deploy constructive-infra-seed ──────────────────────────────────
+# ─── Step 5: Deploy platform metadata seed ───────────────────────────────────
 
-step 5 "Deploying constructive-infra-seed (function + secret definitions)"
+step 5 "Deploying constructive-platform-seed (database + schemas + compute API + domain + site)"
+
+SEED_RC=0
+pgpm deploy --yes --database "$DB_NAME" --package constructive-platform-seed > "$DEPLOY_LOG" 2>&1 || SEED_RC=$?
+if [ $SEED_RC -eq 0 ]; then
+  ok "constructive-platform-seed deployed"
+else
+  fail "constructive-platform-seed — deploy output:"
+  sed 's/^/    /' "$DEPLOY_LOG"
+fi
+rm -f "$DEPLOY_LOG"
+
+# ─── Step 6: Deploy constructive-infra-services ──────────────────────────────
+
+step 6 "Deploying constructive-infra-services (function module registration)"
+
+SVC_RC=0
+pgpm deploy --yes --database "$DB_NAME" --package constructive-infra-services > "$DEPLOY_LOG" 2>&1 || SVC_RC=$?
+if [ $SVC_RC -eq 0 ]; then
+  ok "constructive-infra-services deployed"
+else
+  fail "constructive-infra-services — deploy output:"
+  sed 's/^/    /' "$DEPLOY_LOG"
+fi
+rm -f "$DEPLOY_LOG"
+
+# ─── Step 7: Deploy constructive-infra-seed ──────────────────────────────────
+
+step 7 "Deploying constructive-infra-seed (function + secret definitions)"
 
 SEED_RC=0
 pgpm deploy --yes --database "$DB_NAME" --package constructive-infra-seed > "$DEPLOY_LOG" 2>&1 || SEED_RC=$?
@@ -160,9 +188,9 @@ rm -f "$DEPLOY_LOG"
 
 cd "$ROOT_DIR"
 
-# ─── Step 6: Start MinIO ────────────────────────────────────────────────────
+# ─── Step 8: Start MinIO ────────────────────────────────────────────────────
 
-step 6 "Starting MinIO (object storage)"
+step 8 "Starting MinIO (object storage)"
 
 MINIO_UP=$(docker ps --filter "name=minio" --filter "status=running" --format "{{.Names}}" 2>/dev/null | head -1)
 
@@ -184,15 +212,15 @@ fi
 echo "  API:     http://localhost:9000"
 echo "  Console: http://localhost:9001  (minioadmin/minioadmin)"
 
-# ─── Step 7: Verify ─────────────────────────────────────────────────────────
+# ─── Step 9: Verify ─────────────────────────────────────────────────────────
 
-step 7 "Verifying platform"
+step 9 "Verifying platform"
 
 "$SCRIPT_DIR/verify-platform.sh" "$DB_NAME"
 
-# ─── Step 8: Check .env ─────────────────────────────────────────────────────
+# ─── Step 10: Check .env ────────────────────────────────────────────────────
 
-step 8 "Loading .env into platform"
+step 10 "Loading .env into platform"
 
 if [ -f "$ROOT_DIR/.env" ]; then
   "$SCRIPT_DIR/load-platform-env.sh" "$ROOT_DIR/.env" "$DB_NAME" || true