# Junie brief: ekosystem UUID system — CNPG wiring and follow-on work

**Status:** Schema files written, `init_prole_app.sql` wired. CNPG manifests and downstream integrations pending.  
**Priority:** Medium — work through tasks in order; Tasks 1–3 are independent, Task 4 depends on Task 1.

---

## Background

A stable routable base36 UUID system has been built for ekosystem (tenant-based federated DB cluster) objects. Two schema files land in `knoe-db/schema/`:

| File | Contents |
|---|---|
| `schema/ekosystem.sql` | Core: `ekosystem_id()`, `ekosystem_decode()`, `ekosystem_tenant()`, `register_tenant()`, `project_prefix()`, `knoe.tenants`, `knoe.ekosystem_seq` |
| `schema/ekosystem_objects.sql` | Objects: `ekosystem_object()`, `ekosystem_kind()`, `object_kinds`, `cross_grants`, `grant_object()`, `revoke_object()`, `can_access()`, `my_grants()` |

**Naming conventions in use:**

```
p_{16-char-uuid}            — project namespace / schema root
u_{16-char-uuid}            — service account / PG role
e_{16-char-uuid}            — embedding store
t_{16-char-uuid}_{name}     — data table     (prefix 19 chars, PG budget: 44 for name)
x_{16-char-uuid}_{name}     — index
```

`init_prole_app.sql` already wires these for direct `psql -f` execution. The CNPG production path (which uses inline `postInitSQL` YAML arrays) needs separate wiring — see Task 1.

**Tenant model:**
- `knoe-db` = tenant_id 0, hardcoded root authority
- All other ekosystems (including `prole`) receive a UUID minted by the root and an assigned integer `tenant_id`
- Run `SELECT * FROM knoe.register_tenant('prole')` once on first deploy and record the output

---

## Task 1 — Wire schema into all three CNPG manifests via ConfigMap

**Why:** CNPG `postInitSQL` is a YAML string array — it cannot reference external files. The functions use PL/pgSQL with dollar-quoting, which is unreadable and fragile when inlined in YAML. The correct CNPG mechanism is a Kubernetes ConfigMap referenced via `postInitApplicationSQLRefs`.

**Files to update:**
- `k8s/knoe/knoe-db.yaml` (k3s production)
- `deploy/gcp/gke/knoe-db.yaml` (GKE)
- `deploy/opentofu/k3s/manifests/knoe/knoe-db.yaml` (OpenTofu k3s)

### Step 1a — Create the ConfigMap manifest

Create `k8s/knoe/knoe-ekosystem-sql.yaml`:

```yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: knoe-ekosystem-sql
  namespace: knoe-db
data:
  ekosystem.sql: |
    <contents of schema/ekosystem.sql verbatim>
  ekosystem_objects.sql: |
    <contents of schema/ekosystem_objects.sql verbatim>
```

Use a Makefile target or a generation script to keep the ConfigMap content in sync with the source SQL files rather than hand-editing. Suggested target: `make k8s/knoe/knoe-ekosystem-sql.yaml`.

### Step 1b — Reference from CNPG cluster manifests

In each CNPG manifest, append to the `bootstrap.initdb` section **after** the existing `postInitSQL` block. The ekosystem SQL must run after extensions and role setup, so order matters:

```yaml
      postInitApplicationSQLRefs:
        configMapRefs:
          - name: knoe-ekosystem-sql
            key: ekosystem.sql
          - name: knoe-ekosystem-sql
            key: ekosystem_objects.sql
```

**Note:** `postInitApplicationSQLRefs` was added in CNPG v1.20. Verify against the running operator version before applying:
```bash
kubectl -n cnpg-system get deployment cnpg-controller-manager \
  -o jsonpath='{.spec.template.spec.containers[0].image}'
```

### Step 1c — Apply and verify

```bash
kubectl apply -f k8s/knoe/knoe-ekosystem-sql.yaml

# Verify functions exist after next cluster bootstrap or via psql:
psql "host=pg.prole.org ..." -c "\df knoe.ekosystem_*"
psql "host=pg.prole.org ..." -c "SELECT * FROM knoe.ekosystem_decode(knoe.ekosystem_id(0,0));"
```

---

## Task 2 — Register `prole` as tenant 1

**Why:** The `knoe.tenants` table currently only has the root row (tenant_id=0, knoe-db). Prole needs to be registered so its project UUIDs embed the correct `tenant_id=1` in their bits.

**Steps:**
1. Connect to the production DB via `pg.prole.org`
2. Run: `SELECT * FROM knoe.register_tenant('prole');`
3. Record the returned `uuid` — this is prole's stable external identifier:
   - DNS: `db.{uuid}.prole.org`
   - Shown in service-account prefixes: `u_{uuid}`
4. Save the UUID in `conf/` or a new `docs/ekosystem-tenants.md` for reference
5. When generating prole project IDs, use `tenant_id=1`:
   `SELECT knoe.ekosystem_id(1, 0);`

---

## Task 3 — Python counterpart utility

**Why:** ClickHouse and SQLite nodes cannot call PostgreSQL functions. Application-layer code (Python) needs to mint ekosystem IDs without a PG connection.

**Location:** `src/knoe/ekosystem.py` (or `lib/ekosystem.py` depending on project layout)

**Spec:**

```python
EPOCH_MS   = 1767225600000  # 2026-01-01 00:00:00 UTC
ALPHABET   = '0123456789abcdefghijklmnopqrstuvwxyz'

# Bit layout: [49:ts_ms | 12:tenant | 10:shard | 11:seq]
# Must produce identical output to knoe.ekosystem_id() in PostgreSQL.

class EkosystemID:
    def __init__(self, tenant_id: int, shard_id: int): ...
    def generate(self) -> str: ...           # thread-safe, per-ms atomic seq
    def project_prefix(self) -> str: ...     # 'p_{uuid}_'
    def object_name(self, kind: str) -> str: # '{prefix}_{uuid}'

def decode(uid: str) -> dict: ...            # tenant_id, shard_id, ts_ms, seq, issued_at
def can_access(uid: str, kind: str, tenant_id: int, grants: list) -> bool: ...
```

The per-ms atomic counter (`seq`) should use `threading.Lock()` — same Snowflake pattern as the SQL version. No global database locking.

Include a round-trip test: `assert decode(EkosystemID(1, 0).generate())['tenant_id'] == 1`

---

## Task 4 — Align `knoe.user` with ekosystem user UUIDs

**Why:** `knoe.user` (in the CNPG manifests) uses `SERIAL` integer IDs. Users created via the ekosystem system get `u_{uuid}` PG role names. These two identity systems need a join column so that a Kerberos/LDAP principal can be resolved to both their `knoe.user.id` (for existing app code) and their ekosystem UUID (for routing and LDAP group membership in cross-grants).

**Steps:**
1. Add `ekosystem_uuid text UNIQUE` column to `knoe.user`:
   ```sql
   ALTER TABLE knoe.user ADD COLUMN IF NOT EXISTS ekosystem_uuid text UNIQUE;
   ```
2. When a new user is provisioned, call `knoe.ekosystem_id(tenant_id, shard_id)` to mint their UUID and write it to `ekosystem_uuid`
3. Add a migration entry in the CNPG manifests' `postInitSQL` for the new column (or apply directly to the live DB and track in `docs/TODO.md`)

---

## Task 5 — LDAP/Samba AD: wire `cross_grants` to AD group membership

**Why:** `knoe.cross_grants` is the policy source of truth for cross-ekosystem sharing. The Samba AD domain controller (`myrddin.prole.org`) enforces access at the auth layer. These need to be kept in sync.

**Spec (design only — implementation requires knoe-auth work to be further along):**
- A periodic reconciler reads `knoe.my_grants(tenant_id)` for each registered tenant
- For each active `received` grant, it ensures the grantee's AD user/group is a member of the AD group corresponding to the grantor's project
- AD group naming convention: `ekosystem-{object_uuid}` (stays under 64-char SAM-Account-Name limit at 10+16=26 chars)
- Revoking a grant removes the AD group membership

**Prerequisite:** `pg_oauth` / `pg-knoe-auth` OIDC path must be further along so the reconciler can authenticate to PG using a service Kerberos principal.

---

## Acceptance criteria (all tasks)

```sql
-- Task 1: functions exist in production
SELECT routine_name FROM information_schema.routines
WHERE routine_schema = 'knoe' AND routine_name LIKE 'ekosystem%';

-- Task 2: prole registered
SELECT * FROM knoe.tenants;
-- expect: (0, NULL, 'knoe-db'), (1, '{16-char-uuid}', 'prole')

-- Task 3: Python output matches SQL output for same inputs
-- (unit test in test suite)

-- Task 4: knoe.user has ekosystem_uuid column
\d knoe.user

-- Task 5: design doc only for now
```