Update README.md with additional setup instructions

- Added detailed setup instructions for new users.
- Clarified the installation process and prerequisites.
- Included examples for better understanding.
- Improved formatting for readability.

README.md

@@ -16,7 +16,7 @@ This is a curated PD12M dataset for use with the [Chipmunk](https://github.com/I
 
 ### Dataset Description
 
-This dataset comprises a curated PD12M image collection, refined by filtering for active image links. EXIF data was extracted, and images underwent preprocessing and feature extraction using SigLIP2. All vector embeddings are normalized 16-bit half-precision vectors optimized for L2 indexing with [vectorchord](https://github.com/tensorchord/vectorchord).  
+This dataset comprises a curated PD12M image collection, refined by filtering for active image links. EXIF data was extracted, and images underwent preprocessing and feature extraction using SigLIP2. All vector embeddings are normalized 16-bit half-precision vectors optimized for L2 indexing with [vectorchord](https://github.com/tensorchord/vectorchord).
 
 ### Dataset Sources
 
@@ -49,15 +49,15 @@ CREATE TABLE IF NOT EXISTS is_pd12m (
     processed_width BIGINT NOT NULL DEFAULT 0,
     processed_height BIGINT NOT NULL DEFAULT 0,
     aspect_ratio DOUBLE PRECISION NOT NULL DEFAULT 0,
-    exif JSONB NOT NULL DEFAULT '{EMPTY_OBJECT}',
-    meta JSONB NOT NULL DEFAULT '{EMPTY_OBJECT}',
+    exif JSONB NOT NULL DEFAULT '{}',
+    meta JSONB NOT NULL DEFAULT '{}',
     source JSONB NOT NULL DEFAULT '[]',
     vector halfvec(1152) DEFAULT NULL,
     created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
     updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
 );
 ```
-  
+
 2. Load csv file to database
 
 2.1. Load the dataset from local file system to a remote PostgreSQL server:
@@ -94,17 +94,16 @@ CREATE INDEX IF NOT EXISTS is_pd12m_meta_index ON is_pd12m USING gin(meta);
 CREATE INDEX IF NOT EXISTS is_pd12m_source_index ON is_pd12m USING gin(source);
 CREATE INDEX IF NOT EXISTS is_pd12m_created_at_index ON is_pd12m (created_at);
 CREATE INDEX IF NOT EXISTS is_pd12m_updated_at_index ON is_pd12m (updated_at);
-CREATE INDEX IF NOT EXISTS {table_name}_vector_index ON is_pd12m USING vchordrq (vector halfvec_l2_ops)  WITH (options = $$
+CREATE INDEX IF NOT EXISTS is_pd12m_vector_index ON is_pd12m USING vchordrq (vector halfvec_l2_ops)  WITH (options = $$
     residual_quantization = true
     [build.internal]
     lists = [20000]
     build_threads = 6
     spherical_centroids = false
 $$);
-f"CREATE INDEX IF NOT EXISTS is_pd12m_caption_index ON is_pd12m (caption) WHERE caption = '';
-f"CREATE INDEX IF NOT EXISTS is_pd12m_caption_long_index ON is_pd12m (caption_long) WHERE caption_long = '';
-f'CREATE INDEX IF NOT EXISTS is_pd12m_vector_null_index ON is_pd12m (vector) WHERE vector IS NULL;
+CREATE INDEX IF NOT EXISTS is_pd12m_caption_index ON is_pd12m (caption) WHERE caption = '';
+CREATE INDEX IF NOT EXISTS is_pd12m_caption_long_index ON is_pd12m (caption_long) WHERE caption_long = '';
+CREATE INDEX IF NOT EXISTS is_pd12m_vector_null_index ON is_pd12m (vector) WHERE vector IS NULL;
 ```
 
 ## Dataset Structure
-