#516 indexer and backend for DAO contract

[ncoquelet]

• index all dao events
• add backend routes
• add docker image

database migration need to be done manually, I have a issue to automate it with docker for moment

[ncoquelet]

Instructions

Deployment of indexer-v2 on Railway

To deploy indexer-v2 on Railway, follow these steps:

• Create a new PostgreSQL instance.
• Run the drizzle:migrate script locally in indexer-v2-db, using the new database URL in the .env file.
• Create a new container using the railway.indexer-v2.json configuration and setup the variable INDEXER_V2_DATABASE_URL.

Update of data-backend Configuration

• To complete the setup, add the environment variable INDEXER_V2_DATABASE_URL to the data-backend service.