feat: add hyperswitch ai chats table

[JeevaRamu0104]

Type of Change

• Bugfix
• New feature
• Enhancement
• Refactoring
• Dependency updates
• Documentation
• CI/CD

Description

• Store the user query and response from the ai service for the analysis.
• Allow the api only for internal user

Additional Changes

This pull request introduces support for encrypted chat conversations and adds database models and APIs for storing and retrieving chat interactions. The changes span configuration, API models, database schema, and core logic to enable secure chat storage and querying, with proper secret management for encryption keys.

Chat encryption and configuration:

• Added encryption_key to [chat] sections in all config files and updated ChatSettings to use a secret for the encryption key, with secret management integration for secure handling.

Chat API model extensions:

• Added new API models for listing chat conversations (ChatListRequest, ChatConversation, ChatListResponse)

Database schema and models for chat interactions:

• Introduced hyperswitch_ai_interaction table and corresponding Rust models for storing encrypted chat queries and

Core chat logic improvements:

• Enhanced chat workflow to fetch role information, set entity type, and use the decrypted chat encryption key for secure communication with the AI service.

Run this as part of migration

1.Manual Partition creation for next two year.
2.Creates partitions for each 3-month range
3.Add calendar event to re run this after two year.

DO $$
DECLARE
    start_date date;
    end_date date;
    i int;
    partition_name text;
BEGIN
    -- Get start date as the beginning of the current quarter
    start_date := date_trunc('quarter', current_date)::date;

    -- Create 8 quarterly partitions (2 years)
    FOR i IN 1..8 LOOP
        end_date := (start_date + interval '3 month')::date;

        partition_name := format(
            'hyperswitch_ai_interaction_%s_q%s',
            to_char(start_date, 'YYYY'),
            extract(quarter from start_date)
        );

        EXECUTE format(
            'CREATE TABLE IF NOT EXISTS %I PARTITION OF hyperswitch_ai_interaction
             FOR VALUES FROM (%L) TO (%L)',
            partition_name, start_date, end_date
        );

        start_date := end_date;
    END LOOP;
END$$;

General enhancements and constants:

• Added default limit and offset constants for list operations, improving pagination support for chat conversation queries.

• This PR modifies the API contract
• This PR modifies the database schema
• This PR modifies application configuration/environment variables

Motivation and Context

Closes #8847

How did you test it?

Hitting AI service, should store information in DB

curl --location 'http://localhost:8080/chat/ai/data' \
--header 'x-feature: integ-custom' \
--header 'x-chat-session-id: chat-dop' \
--header 'Content-Type: application/json' \
--header 'Authorization: Bearer JWT' \
--data '{
        "message": "total count of payments"
    
}'

Can check hyperswitch AI interaction table for it.

Internal roles can see the list of interactions for the given merchant id
List

curl --location 'http://localhost:8080/chat/ai/list?merchant_id=merchant_id' \
--header 'Authorization: Bearer JWT' \
--data ''

Checklist

• I formatted the code cargo +nightly fmt --all
• I addressed lints thrown by cargo clippy
• I reviewed the submitted code
• I added unit tests for my changes where possible

[semanticdiff-com]

Review changes with  

Changed Files

File	Status
crates/router/src/types/storage.rs	87% smaller
crates/diesel_models/src/lib.rs	87% smaller
crates/api_models/src/events/chat.rs	83% smaller
crates/router/src/routes/app.rs	82% smaller
crates/router/src/configs/settings.rs	50% smaller
crates/router/src/core/chat.rs	14% smaller
crates/router/src/db.rs	5% smaller
crates/router/src/routes/lock_utils.rs	4% smaller
config/config.example.toml	Unsupported file format
config/deployments/env_specific.toml	Unsupported file format
config/development.toml	Unsupported file format
config/docker_compose.toml	Unsupported file format
crates/api_models/src/chat.rs	0% smaller
crates/common_utils/src/consts.rs	0% smaller
crates/diesel_models/src/hyperswitch_ai_interaction.rs	0% smaller
crates/diesel_models/src/query.rs	0% smaller
crates/diesel_models/src/query/hyperswitch_ai_interaction.rs	0% smaller
crates/diesel_models/src/query/utils.rs	0% smaller
crates/diesel_models/src/schema.rs	0% smaller
crates/diesel_models/src/schema_v2.rs	0% smaller
crates/hyperswitch_domain_models/src/chat.rs	0% smaller
crates/router/src/configs/secrets_transformers.rs	0% smaller
crates/router/src/core/errors/chat.rs	0% smaller
crates/router/src/db/hyperswitch_ai_interaction.rs	0% smaller
crates/router/src/db/kafka_store.rs	0% smaller
crates/router/src/routes/chat.rs	0% smaller
crates/router/src/types/storage/hyperswitch_ai_interaction.rs	0% smaller
crates/router/src/utils.rs	0% smaller
crates/router/src/utils/chat.rs	0% smaller
crates/router_env/src/logger/types.rs	0% smaller
crates/storage_impl/src/mock_db.rs	0% smaller
loadtest/config/development.toml	Unsupported file format
migrations/2025-07-21-120614_add_table_for_hyperswitch_ai_interactions/down.sql	Unsupported file format
migrations/2025-07-21-120614_add_table_for_hyperswitch_ai_interactions/up.sql	Unsupported file format

[SanchithHegde]

Other than that, looks good to me!

[sai-harsha-vardhan]

Core changes looks good!

[sai-harsha-vardhan]

Core changes looks good