@langchain/langgraph-checkpoint-postgres/dist/migrations.js

LangGraph

import { getTablesWithSchema } from "./sql.js";
/**
 * To add a new migration, add a new string to the list returned by the getMigrations function.
 * The position of the migration in the list is the version number.
 */
export const getMigrations = (schema) => {
    const SCHEMA_TABLES = getTablesWithSchema(schema);
    return [
        `CREATE TABLE IF NOT EXISTS ${SCHEMA_TABLES.checkpoint_migrations} (
    v INTEGER PRIMARY KEY
  );`,
        `CREATE TABLE IF NOT EXISTS ${SCHEMA_TABLES.checkpoints} (
    thread_id TEXT NOT NULL,
    checkpoint_ns TEXT NOT NULL DEFAULT '',
    checkpoint_id TEXT NOT NULL,
    parent_checkpoint_id TEXT,
    type TEXT,
    checkpoint JSONB NOT NULL,
    metadata JSONB NOT NULL DEFAULT '{}',
    PRIMARY KEY (thread_id, checkpoint_ns, checkpoint_id)
  );`,
        `CREATE TABLE IF NOT EXISTS ${SCHEMA_TABLES.checkpoint_blobs} (
    thread_id TEXT NOT NULL,
    checkpoint_ns TEXT NOT NULL DEFAULT '',
    channel TEXT NOT NULL,
    version TEXT NOT NULL,
    type TEXT NOT NULL,
    blob BYTEA,
    PRIMARY KEY (thread_id, checkpoint_ns, channel, version)
  );`,
        `CREATE TABLE IF NOT EXISTS ${SCHEMA_TABLES.checkpoint_writes} (
    thread_id TEXT NOT NULL,
    checkpoint_ns TEXT NOT NULL DEFAULT '',
    checkpoint_id TEXT NOT NULL,
    task_id TEXT NOT NULL,
    idx INTEGER NOT NULL,
    channel TEXT NOT NULL,
    type TEXT,
    blob BYTEA NOT NULL,
    PRIMARY KEY (thread_id, checkpoint_ns, checkpoint_id, task_id, idx)
  );`,
        `ALTER TABLE ${SCHEMA_TABLES.checkpoint_blobs} ALTER COLUMN blob DROP not null;`,
    ];
};
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