Add device data model and ITAM service

Introduce device, posture, and enrollment-token entities with ITAM
service policies for agent-managed fleet inventory.

Signed-off-by: Ludovic Vielle <ludovic@probo.com>

pkg/coredata/device_enrollment_token.go

@@ -0,0 +1,169 @@
+// Copyright (c) 2026 Probo Inc <hello@probo.com>.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package coredata
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"time"
+
+	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgconn"
+	"go.gearno.de/kit/pg"
+	"go.probo.inc/probo/pkg/gid"
+)
+
+type DeviceEnrollmentToken struct {
+	ID          gid.GID      `db:"id"`
+	TenantID    gid.TenantID `db:"tenant_id"`
+	DeviceID    gid.GID      `db:"device_id"`
+	HashedValue []byte       `db:"hashed_value"`
+	ExpiresAt   time.Time    `db:"expires_at"`
+	CreatedAt   time.Time    `db:"created_at"`
+}
+
+func (t *DeviceEnrollmentToken) Insert(
+	ctx context.Context,
+	conn pg.Tx,
+	scope Scoper,
+) error {
+	q := `
+INSERT INTO device_enrollment_tokens (
+    id,
+    tenant_id,
+    device_id,
+    hashed_value,
+    expires_at,
+    created_at
+) VALUES (
+    @id,
+    @tenant_id,
+    @device_id,
+    @hashed_value,
+    @expires_at,
+    @created_at
+)
+`
+
+	args := pgx.StrictNamedArgs{
+		"id":           t.ID,
+		"tenant_id":    scope.GetTenantID(),
+		"device_id":    t.DeviceID,
+		"hashed_value": t.HashedValue,
+		"expires_at":   t.ExpiresAt,
+		"created_at":   t.CreatedAt,
+	}
+
+	_, err := conn.Exec(ctx, q, args)
+	if err != nil {
+		if pgErr, ok := errors.AsType[*pgconn.PgError](err); ok {
+			if pgErr.Code == "23505" && pgErr.ConstraintName == "device_enrollment_tokens_hashed_value_unique" {
+				return ErrResourceAlreadyExists
+			}
+		}
+
+		return fmt.Errorf("cannot insert device_enrollment_token: %w", err)
+	}
+
+	return nil
+}
+
+func (t *DeviceEnrollmentToken) LoadByHashedValueForUpdate(
+	ctx context.Context,
+	conn pg.Tx,
+	hashedValue []byte,
+) error {
+	q := `
+SELECT
+    id,
+    tenant_id,
+    device_id,
+    hashed_value,
+    expires_at,
+    created_at
+FROM
+    device_enrollment_tokens
+WHERE
+    hashed_value = @hashed_value
+LIMIT 1
+FOR UPDATE;
+`
+
+	args := pgx.StrictNamedArgs{"hashed_value": hashedValue}
+
+	rows, err := conn.Query(ctx, q, args)
+	if err != nil {
+		return fmt.Errorf("cannot query device_enrollment_tokens: %w", err)
+	}
+
+	token, err := pgx.CollectExactlyOneRow(rows, pgx.RowToStructByName[DeviceEnrollmentToken])
+	if err != nil {
+		if errors.Is(err, pgx.ErrNoRows) {
+			return ErrResourceNotFound
+		}
+
+		return fmt.Errorf("cannot collect device_enrollment_token: %w", err)
+	}
+
+	*t = token
+
+	return nil
+}
+
+func (t *DeviceEnrollmentToken) DeleteExpired(
+	ctx context.Context,
+	conn pg.Tx,
+	now time.Time,
+) (int64, error) {
+	q := `
+DELETE FROM device_enrollment_tokens
+WHERE
+    expires_at < @now
+`
+
+	result, err := conn.Exec(ctx, q, pgx.StrictNamedArgs{"now": now})
+	if err != nil {
+		return 0, fmt.Errorf("cannot delete expired device_enrollment_tokens: %w", err)
+	}
+
+	return result.RowsAffected(), nil
+}
+
+func (t *DeviceEnrollmentToken) Delete(
+	ctx context.Context,
+	conn pg.Tx,
+) error {
+	q := `
+DELETE FROM device_enrollment_tokens
+WHERE
+    id = @id
+`
+
+	args := pgx.StrictNamedArgs{"id": t.ID}
+
+	_, err := conn.Exec(ctx, q, args)
+	if err != nil {
+		return fmt.Errorf("cannot delete device_enrollment_token: %w", err)
+	}
+
+	return nil
+}