Delete Previously Existing Tables if Created from old SQLAlchemy migr…

…ations (#423)

migrations/sql/00000001_initialize_schema.down.sql

@@ -1,19 +1,19 @@
-drop table metric;
+drop table metric cascade;
 
-drop table confusion_matrix;
+drop table confusion_matrix cascade;
 
-drop table evaluation;
+drop table evaluation cascade;
 
-drop table groundtruth;
+drop table groundtruth cascade;
 
-drop table prediction;
+drop table prediction cascade;
 
-drop table label;
+drop table label cascade;
 
-drop table annotation;
+drop table annotation cascade;
 
-drop table model;
+drop table model cascade;
 
-drop table datum;
+drop table datum cascade;
 
-drop table dataset;
+drop table dataset cascade;

migrations/sql/00000001_initialize_schema.up.sql

@@ -1,6 +1,17 @@
 create extension if not exists "postgis";
 create extension if not exists "postgis_raster";
 
+drop table if exists metric cascade;
+drop table if exists confusion_matrix cascade;
+drop table if exists evaluation cascade;
+drop table if exists groundtruth cascade;
+drop table if exists prediction cascade;
+drop table if exists label cascade;
+drop table if exists annotation cascade;
+drop table if exists model cascade;
+drop table if exists datum cascade;
+drop table if exists dataset cascade;
+
 create table label
 (
     id         serial
@@ -189,4 +200,3 @@ create table prediction
 
 create index ix_prediction_id
     on prediction (id);
-