[Issue 2665] Add search path to db connection params (#2836)

## Summary
Fixes #2665 

### Time to review: __1 min__

## Changes proposed
> What was added, updated, or removed in this PR.

Added search path to db connection params.

## Context for reviewers
> Testing instructions, background context, more in-depth details of the
implementation, and anything else you'd like to call out or ask
reviewers. Explain how the changes were verified.

This is latest step in a series of attempts to resolve failed db
connections and privileges from /analytics step functions. See ticket
history and comments for details.

## Additional information
> Screenshots, GIF demos, code examples or output to help show the
changes working as expected.

analytics/config.py

@@ -17,6 +17,7 @@ class DBSettings(PydanticBaseEnvConfig):
      user: str = Field (alias="DB_USER")
      password: Optional[str] = Field(None, alias="DB_PASSWORD")
      ssl_mode: str = Field("require", alias="DB_SSL_MODE")
+     db_schema: str = Field ("app", alias="DB_SCHEMA")
      slack_bot_token: str = Field(alias="ANALYTICS_SLACK_BOT_TOKEN")
      reporting_channel_id: str = Field(alias="ANALYTICS_REPORTING_CHANNEL_ID")
      aws_region: Optional[str] = Field(None, alias="AWS_REGION")

analytics/local.env

@@ -12,6 +12,7 @@ DB_NAME=app
 DB_USER=app
 DB_PASSWORD=secret123
 DB_SSL_MODE=allow
+DB_SCHEMA=public
 
 # When an error occurs with a SQL query,
 # whether or not to hide the parameters which
@@ -37,4 +38,4 @@ MB_DB_HOST=grants-analytics-db
 # Set these in your shell
 # by doing `export ANALYTICS_REPORTING_CHANNEL_ID=whatever`
 ANALYTICS_REPORTING_CHANNEL_ID=DO_NOT_SET_HERE
-ANALYTICS_SLACK_BOT_TOKEN=DO_NOT_SET_HERE
+ANALYTICS_SLACK_BOT_TOKEN=DO_NOT_SET_HERE

analytics/src/analytics/integrations/db.py

@@ -60,6 +60,7 @@ def get_connection_parameters(config: DBSettings) -> dict[str, Any]:
         "port": config.port,
         "connect_timeout": 20,
         "sslmode": config.ssl_mode,
+        "options": f"-c search_path={config.db_schema}",
     }