__init__.py: define default columns for tables

Problem: The default fields for the relevant tables in the
flux-accounting DB are defined manually throughout the bindings,
so it makes sense to define these globally in the accounting Python
fluxacct.accounting package.

Create a definition for the names of the columns in some of the tables
in __init__.py so that they can be referenced throughout the Python
bindings for flux-accounting.

src/bindings/python/fluxacct/accounting/__init__.py.in

@@ -2,4 +2,53 @@ db_dir = "@X_LOCALSTATEDIR@/lib/flux/"
 db_path = "@X_LOCALSTATEDIR@/lib/flux/FluxAccounting.db"
 db_schema_version = 23
 
-__all__ = ["db_dir", "db_path", "db_schema_version"]
+# flux-accounting DB table column names
+ASSOCIATION_TABLE = [
+    "creation_time",
+    "mod_time",
+    "active",
+    "username",
+    "userid",
+    "bank",
+    "default_bank",
+    "shares",
+    "job_usage",
+    "fairshare",
+    "max_running_jobs",
+    "max_active_jobs",
+    "max_nodes",
+    "queues",
+    "projects",
+    "default_project",
+]
+BANK_TABLE = ["bank_id", "bank", "active", "parent_bank", "shares", "job_usage"]
+QUEUE_TABLE = [
+    "queue",
+    "min_nodes_per_job",
+    "max_nodes_per_job",
+    "max_time_per_job",
+    "priority",
+]
+PROJECT_TABLE = ["project_id", "project", "usage"]
+JOBS_TABLE = [
+    "id",
+    "userid",
+    "t_submit",
+    "t_run",
+    "t_inactive",
+    "ranks",
+    "R",
+    "jobspec",
+    "project",
+]
+
+__all__ = [
+    "db_dir",
+    "db_path",
+    "db_schema_version",
+    "ASSOCIATION_TABLE",
+    "BANK_TABLE",
+    "QUEUE_TABLE",
+    "PROJECT_TABLE",
+    "JOBS_TABLE",
+]