Feature/costs assumptions

Added table exposure_entities_costs_assumptions.

Associated with: https://git.gfz-potsdam.de/dynamicexposure/globaldynamicexposure/gde-importer/-/merge_requests/26.

\approve @fd

\fyi @ds

migrations/00005_create-table-exposure-entities-costs-assumptions.sql

+CREATE TABLE public.exposure_entities_costs_assumptions
+(
+    aggregated_source_id SMALLINT,
+    exposure_entity CHAR(3),
+    occupancy_case occupancycase,
+    structural FLOAT,
+    non_structural FLOAT,
+    contents FLOAT,
+    currency VARCHAR,
+
+    PRIMARY KEY (exposure_entity, occupancy_case, aggregated_source_id)
+
+);
+
+ALTER TABLE public.exposure_entities_costs_assumptions
+OWNER TO postgres;