feat(deploy): production deployment setup and fixes

- Debian-based api image (bookworm-slim), docker/debian mirrors, prisma binaryTargets for openssl 3.0 - nginx: admin SPA under /admin, TLS via acme.sh (ZeroSSL) + auto-renewal cron, http->https redirect - prisma: add origin_goods.delisted migration, sync missing schema (good_image/tag_font_color/good_tags), fix users.createdAt Timestamptz - api: CORS wildcard reflection, helmet CORP cross-origin, price backfill in persistProductDetail, categoryIcon ancestor fallback, mediaByColor per-color gallery in public goods detail - admin: /admin base path (vite + router) - import-data.mjs: udt_name casting, serial sequence advance fix
2026-08-26 14:23:09 +08:00
parent be0b90e68f
commit 6c61a4e871
982 changed files with 74156 additions and 179393 deletions
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---
-title: Eliminate N+1 Queries with Batch Loading
-impact: MEDIUM-HIGH
-impactDescription: 10-100x fewer database round trips
-tags: n-plus-one, batch, performance, queries
---
-
-## Eliminate N+1 Queries with Batch Loading
-
-N+1 queries execute one query per item in a loop. Batch them into a single query using arrays or JOINs.
-
-**Incorrect (N+1 queries):**
-
-```sql
-- First query: get all users
-select id from users where active = true;  -- Returns 100 IDs
-
-- Then N queries, one per user
-select * from orders where user_id = 1;
-select * from orders where user_id = 2;
-select * from orders where user_id = 3;
-- ... 97 more queries!
-
-- Total: 101 round trips to database
-```
-
-**Correct (single batch query):**
-
-```sql
-- Collect IDs and query once with ANY
-select * from orders where user_id = any(array[1, 2, 3, ...]);
-
-- Or use JOIN instead of loop
-select u.id, u.name, o.*
-from users u
-left join orders o on o.user_id = u.id
-where u.active = true;
-
-- Total: 1 round trip
-```
-
-Application pattern:
-
-```sql
-- Instead of looping in application code:
-- for user in users: db.query("SELECT * FROM orders WHERE user_id = $1", user.id)
-
-- Pass array parameter:
-select * from orders where user_id = any($1::bigint[]);
-- Application passes: [1, 2, 3, 4, 5, ...]
-```
-
-Reference: [N+1 Query Problem](https://supabase.com/docs/guides/database/query-optimization)