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db/migrations/2026-10-12-01-drop-dedup-add-embeddings.sql

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+-- 2026-10-12-01 下线 pHash 去重 + 启用 image_embeddings 存 FashionSigLIP 向量
+--
+-- 对应规格：docs/superpowers/specs/2026-10-12-fashionclip-siglip-vision-service-design.md §5.2 / §8
+--
+-- 不可逆：DROP COLUMN / DROP TABLE 无回滚手段，执行前务必确认 db/backups/ 有备份。
+--
+-- 应用后请重新导出结构：
+--   ./bin/dbtool dump -clean -out db/backups/db_dump.sql
+
+-- ---------------------------------------------------------------------------
+-- ① 下线自动去重：DROP 三列 + 两个 HNSW 索引
+--
+-- 注意：两个图片视图为 `SELECT i.*`，因此**必须先删视图**，删列后再按 `i.*` 重建——
+-- 否则 DROP COLUMN 会报 "cannot drop column ... because other objects depend on it"。
+-- 重建后 `i.*` 展开的列集自动不含已删的三列，无需显式枚举。
+-- （与 db/migrations/2026-09-24-01-runway-parent-image-id.sql 处理 look_index 的做法一致。）
+-- ---------------------------------------------------------------------------
+DROP VIEW IF EXISTS public_brand_runway_images;
+DROP VIEW IF EXISTS public_street_snap_images;
+
+DROP INDEX IF EXISTS brand_runway_images_phash_hnsw;
+DROP INDEX IF EXISTS street_snap_images_phash_hnsw;
+
+ALTER TABLE brand_runway_images
+  DROP COLUMN IF EXISTS phash,
+  DROP COLUMN IF EXISTS is_duplicate,
+  DROP COLUMN IF EXISTS dup_of;
+
+ALTER TABLE street_snap_images
+  DROP COLUMN IF EXISTS phash,
+  DROP COLUMN IF EXISTS is_duplicate,
+  DROP COLUMN IF EXISTS dup_of;
+
+CREATE VIEW public_brand_runway_images AS
+  SELECT i.* FROM brand_runway_images i
+  JOIN brand_runways r ON r.id = i.runway_id
+  WHERE i.is_deleted = 0 AND r.status = 'published' AND r.is_deleted = 0;
+
+CREATE VIEW public_street_snap_images AS
+  SELECT i.* FROM street_snap_images i
+  JOIN street_snaps s ON s.id = i.snap_id
+  WHERE i.is_deleted = 0 AND s.status = 'published' AND s.is_deleted = 0;
+
+-- ---------------------------------------------------------------------------
+-- ② 删死表 image_duplicates（2026-09-21 建表后全仓零引用）
+-- ---------------------------------------------------------------------------
+DROP TABLE IF EXISTS image_duplicates;
+
+-- ---------------------------------------------------------------------------
+-- ③ image_embeddings 改造为可用状态
+--    该表 2026-09-21 建表后一直零引用、零数据，此处原地改造：
+--      - kind: smallint -> varchar(8)，对齐 dto.IngestKind（"runway" / "street"）
+--      - embedding: vector(512) -> vector(768)，M0 实测模型输出 768 维
+--      - 补 (kind, image_id) 唯一索引：原表只有自增主键，
+--        不加唯一约束会导致同一张图重复写入多行
+-- ---------------------------------------------------------------------------
+ALTER TABLE image_embeddings
+  ALTER COLUMN kind TYPE varchar(8) USING kind::varchar(8),
+  ALTER COLUMN embedding TYPE vector(768);
+
+-- 旧向量维度与新维度不同，重建该列上的 HNSW 索引（pgvector 索引绑定列的 typmod）
+DROP INDEX IF EXISTS image_embeddings_vec_idx;
+
+CREATE UNIQUE INDEX IF NOT EXISTS uq_image_embeddings_kind_image
+  ON image_embeddings (kind, image_id);
+
+CREATE INDEX IF NOT EXISTS image_embeddings_vec_idx
+  ON image_embeddings USING hnsw (embedding vector_cosine_ops);