Added support for schema level restriction. Fixes #5583

Allow user to edit the connection properties when the database server
is already connected.

web/migrations/versions/84700139beb0_.py

@@ -0,0 +1,32 @@
+
+"""empty message
+
+Revision ID: 84700139beb0
+Revises: d39482714a2e
+Create Date: 2020-06-24 15:53:56.489518
+
+"""
+from pgadmin.model import db
+
+
+# revision identifiers, used by Alembic.
+revision = '84700139beb0'
+down_revision = 'd39482714a2e'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    db.engine.execute("""
+        CREATE TABLE "database" (
+            "id"	INTEGER NOT NULL,
+            "schema_res"	TEXT,
+            "server"	INTEGER NOT NULL,
+            PRIMARY KEY("id","server"),
+            FOREIGN KEY("server") REFERENCES "server"("id")
+        );
+    """)
+
+
+def downgrade():
+    pass