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play-life-backend/migrations/002_add_dictionaries.sql

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+-- Migration: Add dictionaries table and dictionary_id to words
+-- This script creates the dictionaries table and adds dictionary_id field to words table
+
+-- ============================================
+-- Table: dictionaries
+-- ============================================
+CREATE TABLE IF NOT EXISTS dictionaries (
+    id SERIAL PRIMARY KEY,
+    name VARCHAR(255) NOT NULL
+);
+
+-- Insert default dictionary "Все слова" with id = 0
+-- Note: PostgreSQL SERIAL starts from 1, so we need to use a workaround
+-- First, set the sequence to allow inserting 0, then insert, then reset sequence
+DO $$
+BEGIN
+    -- Set sequence to -1 so next value will be 0
+    PERFORM setval('dictionaries_id_seq', -1, false);
+    
+    -- Insert the default dictionary with id = 0
+    INSERT INTO dictionaries (id, name) 
+    VALUES (0, 'Все слова')
+    ON CONFLICT (id) DO NOTHING;
+    
+    -- Set the sequence to start from 1 (so next auto-increment will be 1)
+    PERFORM setval('dictionaries_id_seq', 1, false);
+END $$;
+
+-- ============================================
+-- Alter words table: Add dictionary_id column
+-- ============================================
+ALTER TABLE words 
+ADD COLUMN IF NOT EXISTS dictionary_id INTEGER DEFAULT 0 REFERENCES dictionaries(id);
+
+-- Update all existing words to have dictionary_id = 0
+UPDATE words 
+SET dictionary_id = 0 
+WHERE dictionary_id IS NULL;
+
+-- Make dictionary_id NOT NULL after setting default values
+ALTER TABLE words 
+ALTER COLUMN dictionary_id SET NOT NULL,
+ALTER COLUMN dictionary_id SET DEFAULT 0;
+
+-- Create index on dictionary_id for better join performance
+CREATE INDEX IF NOT EXISTS idx_words_dictionary_id ON words(dictionary_id);
+
+-- ============================================
+-- Comments for documentation
+-- ============================================
+COMMENT ON TABLE dictionaries IS 'Dictionaries table storing dictionary information';
+COMMENT ON COLUMN words.dictionary_id IS 'Reference to dictionary. Default is 0 (Все слова)';
+