**Related Issue(s):**-Fixes#345-Fixes#344-Fixes#336**Description:**This PR consists of self-contained commits (except the first commit thatprovides database_logic deduplication), making it easy to change orremove individual patches. It addresses several small issues, improvesthe performance of certain methods, and adds support fordynamically-generated queryables. This enhancement doesn't require anynew configuration as queryables are generated on the fly based on theos/es mappings. The implementation is designed for extensibility, withbuilt-in logic for augmenting fields metadata with additionalinformation. Currently, it only includes the _DEFAULT_QUERYABLESconfiguration, which was simply copied from the pre-PR code.Example queryables response:```json{"$schema":"https://json-schema.org/draft/2019-09/schema","$id":"https://stac-api.example.com/queryables","type":"object","title":"Queryables for STAC API","description":"Queryable names for the STAC API Item Search filter.","properties":{"bbox":{"title":"Bbox","type":"number"},"collection":{"description":"Collection","$ref":"https://schemas.stacspec.org/v1.0.0/item-spec/json-schema/item.json#/definitions/core/allOf/2/then/properties/collection","title":"Collection","type":"string"},"geometry":{"description":"Geometry","$ref":"https://schemas.stacspec.org/v1.0.0/item-spec/json-schema/item.json#/definitions/core/allOf/1/oneOf/0/properties/geometry","title":"Geometry","type":"object"},"id":{"description":"ID","$ref":"https://schemas.stacspec.org/v1.0.0/item-spec/json-schema/item.json#/definitions/core/allOf/2/properties/id","title":"Id","type":"string"},"stac_extensions":{"title":"Stac Extensions","type":"string"},"stac_version":{"title":"Stac Version","type":"string"},"type":{"title":"Type","type":"string"},"constellation":{"title":"Constellation","type":"string"},"created":{"description":"Creation Timestamp","$ref":"https://schemas.stacspec.org/v1.0.0/item-spec/json-schema/datetime.json#/properties/created","title":"Created","type":"string","format":"date-time"},"datetime":{"description":"Acquisition Timestamp","$ref":"https://schemas.stacspec.org/v1.0.0/item-spec/json-schema/datetime.json#/properties/datetime","title":"Datetime","type":"string","format":"date-time"},"end_datetime":{"title":"End Datetime","type":"string","format":"date-time"},"eopf:datatake_id":{"title":"Eopf:Datatake Id","type":"string"},"eopf:instrument_configuration_id":{"title":"Eopf:Instrument Configuration Id","type":"number"},"instruments":{"title":"Instruments","type":"string"},"platform":{"title":"Platform","type":"string"},"processing:datetime":{"title":"Processing:Datetime","type":"string","format":"date-time"},"processing:facility":{"title":"Processing:Facility","type":"string"},"processing:level":{"title":"Processing:Level","type":"string"},"processing:version":{"title":"Processing:Version","type":"string"},"product:timeliness":{"title":"Product:Timeliness","type":"string"},"product:timeliness_category":{"title":"Product:Timeliness Category","type":"string"},"product:type":{"title":"Product:Type","type":"string"},"published":{"title":"Published","type":"string","format":"date-time"},"sar:center_frequency":{"title":"Sar:Center Frequency","type":"number"},"sar:frequency_band":{"title":"Sar:Frequency Band","type":"string"},"sar:instrument_mode":{"title":"Sar:Instrument Mode","type":"string"},"sar:observation_direction":{"title":"Sar:Observation Direction","type":"string"},"sar:pixel_spacing_azimuth":{"title":"Sar:Pixel Spacing Azimuth","type":"number"},"sar:pixel_spacing_range":{"title":"Sar:Pixel Spacing Range","type":"number"},"sar:polarizations":{"title":"Sar:Polarizations","type":"string"},"sar:resolution_azimuth":{"title":"Sar:Resolution Azimuth","type":"number"},"sar:resolution_range":{"title":"Sar:Resolution Range","type":"number"},"sat:absolute_orbit":{"title":"Sat:Absolute Orbit","type":"integer"},"sat:orbit_cycle":{"title":"Sat:Orbit Cycle","type":"number"},"sat:orbit_state":{"title":"Sat:Orbit State","type":"string"},"sat:platform_international_designator":{"title":"Sat:Platform International Designator","type":"string"},"sat:relative_orbit":{"title":"Sat:Relative Orbit","type":"integer"},"start_datetime":{"title":"Start Datetime","type":"string","format":"date-time"},"updated":{"description":"Creation Timestamp","$ref":"https://schemas.stacspec.org/v1.0.0/item-spec/json-schema/datetime.json#/properties/updated","title":"Updated","type":"string","format":"date-time"},"view:azimuth":{"title":"View:Azimuth","type":"number"},"view:incidence_angle":{"title":"View:Incidence Angle","type":"number"},"auth:schemes.oidc.openIdConnectUrl":{"title":"Auth:Schemes.Oidc.Openidconnecturl","type":"string"},"auth:schemes.oidc.type":{"title":"Auth:Schemes.Oidc.Type","type":"string"},"auth:schemes.s3.type":{"title":"Auth:Schemes.S3.Type","type":"string"},"storage:schemes.cdse-s3.description":{"title":"Storage:Schemes.Cdse-S3.Description","type":"string"},"storage:schemes.cdse-s3.platform":{"title":"Storage:Schemes.Cdse-S3.Platform","type":"string"},"storage:schemes.cdse-s3.requester_pays":{"title":"Storage:Schemes.Cdse-S3.Requester Pays","type":"boolean"},"storage:schemes.cdse-s3.title":{"title":"Storage:Schemes.Cdse-S3.Title","type":"string"},"storage:schemes.cdse-s3.type":{"title":"Storage:Schemes.Cdse-S3.Type","type":"string"},"storage:schemes.creodias-s3.description":{"title":"Storage:Schemes.Creodias-S3.Description","type":"string"},"storage:schemes.creodias-s3.platform":{"title":"Storage:Schemes.Creodias-S3.Platform","type":"string"},"storage:schemes.creodias-s3.requester_pays":{"title":"Storage:Schemes.Creodias-S3.Requester Pays","type":"boolean"},"storage:schemes.creodias-s3.title":{"title":"Storage:Schemes.Creodias-S3.Title","type":"string"},"storage:schemes.creodias-s3.type":{"title":"Storage:Schemes.Creodias-S3.Type","type":"string"}},"additionalProperties":false}```PS. I think the auto-generated "title" should be removed completely, butI included it because I found it to be common practice in some STACprojects. I'm not sure how you feel about it.**PR Checklist:**- [ ] Code is formatted and linted (run `pre-commit run --all-files`)- [ ] Tests pass (run `make test`)- [ ] Documentation has been updated to reflect changes, if applicable- [ ] Changes are added to the changelog---------Co-authored-by: Jonathan Healy <jonathan.d.healy@gmail.com>

**Related Issue(s):**- #**Description:****PR Checklist:**- [x] Code is formatted and linted (run `pre-commit run --all-files`)- [x] Tests pass (run `make test`)- [x] Documentation has been updated to reflect changes, if applicable- [x] Changes are added to the changelog

**Related Issue(s):**-#342 -#343**Description:****PR Checklist:**- [x] Code is formatted and linted (run `pre-commit run --all-files`)- [x] Tests pass (run `make test`)- [x] Documentation has been updated to reflect changes, if applicable- [x] Changes are added to the changelog

**Related Issue(s):**#337 **Description:**- Updated package names in setup.py files to use underscores instead ofperiods for PEP 625 compliance  - Changed `stac_fastapi.opensearch` to `stac_fastapi_opensearch`  - Changed `stac_fastapi.elasticsearch` to `stac_fastapi_elasticsearch`  - Changed `stac_fastapi.core` to `stac_fastapi_core`  - Updated all related dependencies to use the new naming convention- Renamed `docker-compose.yml` to `compose.yml` to align with DockerCompose V2 conventions- Removed deprecated `version` field from all compose files- Updated `STAC_FASTAPI_VERSION` environment variables to 4.0.0a1 in allcompose files- Bumped version from 4.0.0a0 to 4.0.0a1 for the PEP 625 compliantrelease- Updated dependency requirements to use compatible release specifiers(~=) for more controlled updates while allowing for bug fixes andsecurity patches- Removed elasticsearch-dsl dependency as it's now part of theelasticsearch package since version 8.18.0**PR Checklist:**- [x] Code is formatted and linted (run `pre-commit run --all-files`)- [x] Tests pass (run `make test`)- [x] Documentation has been updated to reflect changes, if applicable- [x] Changes are added to the changelog

**Related Issue(s):**-#347 **Description:**#### v4.0.0a2 release #### Added- Added support for high-performance direct response mode for bothElasticsearch and Opensearch backends, controlled by the`ENABLE_DIRECT_RESPONSE` environment variable. When enabled(`ENABLE_DIRECT_RESPONSE=true`), endpoints return Starlette Responseobjects directly, bypassing FastAPI's jsonable_encoder and Pydanticserialization for significantly improved performance on large searchresponses. **Note:** In this mode, all FastAPI dependencies (includingauthentication, custom status codes, and validation) are disabled forall routes. Default is `false` for safety. A warning is logged atstartup if enabled. See [issue#347](#347)#### Changed- Updated test suite to use `httpx.ASGITransport(app=...)` for FastAPIapp testing (removes deprecation warning).- Updated stac-fastapi parent libraries to 5.2.0. - Migrated Elasticsearch index template creation from legacy`put_template` to composable `put_index_template` API in`database_logic.py`. This resolves deprecation warnings and ensurescompatibility with Elasticsearch 7.x and 8.x.- Updated all Pydantic models to use `ConfigDict` instead of class-based`Config` for Pydantic v2 compatibility. This resolves deprecationwarnings and prepares for Pydantic v3.- Migrated all Pydantic `@root_validator` validators to`@model_validator` for Pydantic v2 compatibility.- Migrated startup event handling from deprecated`@app.on_event("startup")` to FastAPI's recommended lifespan contextmanager. This removes deprecation warnings and ensures compatibilitywith future FastAPI versions.**PR Checklist:**- [x] Code is formatted and linted (run `pre-commit run --all-files`)- [x] Tests pass (run `make test`)- [x] Documentation has been updated to reflect changes, if applicable- [x] Changes are added to the changelog

**Related Issue(s):**- #**Description:**- Migrated startup event handling from deprecated `@app.on_event("startup")` to FastAPI's recommended lifespan context manager. This removes deprecation warnings and ensures compatibility with future FastAPI versions**PR Checklist:**- [x] Code is formatted and linted (run `pre-commit run --all-files`)- [x] Tests pass (run `make test`)- [x] Documentation has been updated to reflect changes, if applicable- [x] Changes are added to the changelog

**Description:****Changes from 3.2.5:**#### Added- Added support for dynamically-generated queryables based onElasticsearch/OpenSearch mappings, with extensible metadata augmentation[#351](#351)- Included default queryables configuration for seamless integration.[#351](#351)- Added support for high-performance direct response mode for bothElasticsearch and Opensearch backends, controlled by the`ENABLE_DIRECT_RESPONSE` environment variable. When enabled(`ENABLE_DIRECT_RESPONSE=true`), endpoints return Starlette Responseobjects directly, bypassing FastAPI's jsonable_encoder and Pydanticserialization for significantly improved performance on large searchresponses. **Note:** In this mode, all FastAPI dependencies (includingauthentication, custom status codes, and validation) are disabled forall routes. Default is `false` for safety. A warning is logged atstartup if enabled. See [issue#347](#347)and [PR#359](#359).- Added robust tests for the `ENABLE_DIRECT_RESPONSE` environmentvariable, covering both Elasticsearch and OpenSearch backends. Testsgracefully handle missing backends by attempting to import both configsand skipping if neither is available.[#359](#359)#### Changed- Refactored database logic to reduce duplication[#351](#351)- Replaced `fastapi-slim` with `fastapi` dependency[#351](#351)- Changed minimum Python version to 3.9[#354](#354)- Updated stac-fastapi api, types, and extensions libraries to 5.1.1from 3.0.0 and made various associated changes[#354](#354)- Changed makefile commands from 'docker-compose' to 'docker compose'[#354](#354)- Updated package names in setup.py files to use underscores instead ofperiods for PEP 625 compliance[#358](#358)  - Changed `stac_fastapi.opensearch` to `stac_fastapi_opensearch`  - Changed `stac_fastapi.elasticsearch` to `stac_fastapi_elasticsearch`  - Changed `stac_fastapi.core` to `stac_fastapi_core`  - Updated all related dependencies to use the new naming convention- Renamed `docker-compose.yml` to `compose.yml` to align with DockerCompose V2 conventions[#358](#358)- Removed deprecated `version` field from all compose files[#358](#358)- Updated `STAC_FASTAPI_VERSION` environment variables to 4.0.0 in allcompose files[#362](#362)- Bumped version from 4.0.0a2 to 4.0.0 for the PEP 625 compliant release[#362](#362)- Updated dependency requirements to use compatible release specifiers(~=) for more controlled updates while allowing for bug fixes andsecurity patches[#358](#358)- Removed elasticsearch-dsl dependency as it's now part of theelasticsearch package since version 8.18.0[#358](#358)- Updated test suite to use `httpx.ASGITransport(app=...)` for FastAPIapp testing (removes deprecation warning).[#359](#359)- Updated stac-fastapi parent libraries to 5.2.0.[#359](#359)- Migrated Elasticsearch index template creation from legacy`put_template` to composable `put_index_template` API in`database_logic.py`. This resolves deprecation warnings and ensurescompatibility with Elasticsearch 7.x and 8.x.[#359](#359)- Updated all Pydantic models to use `ConfigDict` instead of class-based`Config` for Pydantic v2 compatibility. This resolves deprecationwarnings and prepares for Pydantic v3.[#359](#359)- Migrated all Pydantic `@root_validator` validators to`@model_validator` for Pydantic v2 compatibility.[#359](#359)- Migrated startup event handling from deprecated`@app.on_event("startup")` to FastAPI's recommended lifespan contextmanager. This removes deprecation warnings and ensures compatibilitywith future FastAPI versions.[#361](#361)- Refactored all boolean environment variable parsing in bothElasticsearch and OpenSearch backends to use the shared `get_bool_env`utility. This ensures robust and consistent handling of environmentvariables such as `ES_USE_SSL`, `ES_HTTP_COMPRESS`, and`ES_VERIFY_CERTS` across both backends.[#359](#359)#### Fixed- Improved performance of `mk_actions` and `filter-links` methods[#351](#351)- Fixed inheritance relating to BaseDatabaseSettings and ApiBaseSettings[#355](#355)- Fixed delete_item and delete_collection methods return types[#355](#355)- Fixed inheritance relating to DatabaseLogic and BaseDatabaseLogic, andApiBaseSettings[#355](#355)**PR Checklist:**- [x] Code is formatted and linted (run `pre-commit run --all-files`)- [x] Tests pass (run `make test`)- [x] Documentation has been updated to reflect changes, if applicable- [x] Changes are added to the changelog