docs(database): 规范脚本顺序并补全字段注释

script/sql/6.rag_chunk.sql

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+DROP TABLE IF EXISTS rag_chunk;
+
+CREATE TABLE rag_chunk (
+    id BIGSERIAL PRIMARY KEY,
+    store_id BIGINT NOT NULL,
+    document_id BIGINT NOT NULL,
+    chunk_index INTEGER NOT NULL,
+    chunk_content TEXT NOT NULL,
+    chunk_summary VARCHAR(1000) DEFAULT '',
+    token_count INTEGER,
+    page_number INTEGER,
+    section_title VARCHAR(255) DEFAULT '',
+    heading_path VARCHAR(1000) DEFAULT '',
+    vector_id VARCHAR(128),
+    metadata_json JSONB NOT NULL DEFAULT '{}'::jsonb,
+    enabled BOOLEAN NOT NULL DEFAULT TRUE,
+    version INTEGER NOT NULL DEFAULT 1,
+    create_time TIMESTAMP,
+    update_time TIMESTAMP,
+    remark VARCHAR(500) DEFAULT '',
+    create_by VARCHAR(64),
+    update_by VARCHAR(64),
+    CONSTRAINT uk_rag_chunk_document_index UNIQUE (document_id, chunk_index),
+    CONSTRAINT fk_rag_chunk_store_id FOREIGN KEY (store_id) REFERENCES rag_store (id),
+    CONSTRAINT fk_rag_chunk_document_id FOREIGN KEY (document_id) REFERENCES rag_document (id)
+);
+
+CREATE INDEX idx_rag_chunk_store_id ON rag_chunk (store_id);
+CREATE INDEX idx_rag_chunk_document_id ON rag_chunk (document_id);
+CREATE INDEX idx_rag_chunk_enabled ON rag_chunk (enabled);
+CREATE INDEX idx_rag_chunk_vector_id ON rag_chunk (vector_id);
+CREATE INDEX idx_rag_chunk_metadata_json ON rag_chunk USING GIN (metadata_json);
+
+COMMENT ON TABLE rag_chunk IS 'RAG知识切片表';
+COMMENT ON COLUMN rag_chunk.id IS 'ID';
+COMMENT ON COLUMN rag_chunk.store_id IS '知识库ID';
+COMMENT ON COLUMN rag_chunk.document_id IS '文档ID';
+COMMENT ON COLUMN rag_chunk.chunk_index IS '文档内切片序号';
+COMMENT ON COLUMN rag_chunk.chunk_content IS '切片内容';
+COMMENT ON COLUMN rag_chunk.chunk_summary IS '切片摘要';
+COMMENT ON COLUMN rag_chunk.token_count IS 'Token数量';
+COMMENT ON COLUMN rag_chunk.page_number IS '页码';
+COMMENT ON COLUMN rag_chunk.section_title IS '章节标题';
+COMMENT ON COLUMN rag_chunk.heading_path IS '标题路径';
+COMMENT ON COLUMN rag_chunk.vector_id IS '向量ID';
+COMMENT ON COLUMN rag_chunk.metadata_json IS '切片级扩展元数据';
+COMMENT ON COLUMN rag_chunk.enabled IS '是否启用';
+COMMENT ON COLUMN rag_chunk.version IS '版本';
+COMMENT ON COLUMN rag_chunk.create_time IS '创建时间';
+COMMENT ON COLUMN rag_chunk.update_time IS '更新时间';
+COMMENT ON COLUMN rag_chunk.remark IS '备注';
+COMMENT ON COLUMN rag_chunk.create_by IS '创建者';
+COMMENT ON COLUMN rag_chunk.update_by IS '更新者';