add test fixture data for local testing

scripts/README_FIXTURE.md

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+## How to create the fixture data
+
+
+On a server with data:
+```
+
+psql -h $DB_HOST -p $DB_PORT -U $DB_USER -d claim -A -f make_fixture.sql > fixture_data.txt
+
+python convert_to_inserts.py  # creates fixture_data.sql
+
+```
+
+## Load the fixture data into local db
+
+On your local development machine:
+
+```
+psql claim -f insert_fixture.sql
+```

scripts/convert_to_inserts.py

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+def create_insert_statements(input_file, output_file):
+    current_table = None
+    header = None
+    data = []
+
+    with open(input_file, 'r') as f:
+        lines = f.readlines()
+
+    with open(output_file, 'w') as f:
+        f.write('BEGIN;\n')
+
+        for line in lines:
+            line = line.strip()
+            if not line:
+                continue
+
+            if line == 'NODES:|':
+                current_table = 'Node'
+                header = None
+                continue
+            elif line == 'EDGES:|':
+                current_table = 'Edge'
+                header = None
+                continue
+            elif line == 'CLAIMS:|':
+                current_table = 'Claim'
+                header = None
+                continue
+
+            if header is None:
+                header = line.split('|')
+                continue
+
+            values = line.split('|')
+            columns = ','.join(f'"{h}"' for h in header)
+            value_list = ','.join(
+                'NULL' if v == '\\N' or v == '' 
+                else f"'{v}'" if not v.replace('.','').replace('-','').replace('+','').isdigit() 
+                else v 
+                for v in values
+            )
+            f.write(f'INSERT INTO "{current_table}" ({columns}) VALUES ({value_list});\n')
+
+        f.write('COMMIT;\n')
+
+create_insert_statements('fixture_data.txt', 'insert_fixture.sql')