brancher: insert stream name into the table

In preparation for more branchers insert stream name
into the database.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>

deploy/contest/db

@@ -49,6 +49,7 @@ CREATE INDEX ON branches (branch DESC);
 
 CREATE TABLE branches (
     branch              varchar(80),
+    stream              varchar(60),
     t_date              timestamp,
     base                varchar(80),
     url                 varchar(200),

pw_brancher.py

@@ -179,6 +179,7 @@ def apply_local_patches(config, tree) -> List:
 def db_insert(config, state, name):
     global psql_conn
 
+    pfx = config.get("target", "branch_pfx")
     pub_url = config.get('target', 'public_url')
     row = {"branch": name,
            "date": state["branches"][name],
@@ -187,9 +188,11 @@ def db_insert(config, state, name):
     row |= state["info"][name]
 
     with psql_conn.cursor() as cur:
-        arg = cur.mogrify("(%s,%s,%s,%s,%s)", (row["branch"], row["date"], row["base"], row["url"],
-                                               json.dumps(row)))
-        cur.execute("INSERT INTO branches VALUES " + arg.decode('utf-8'))
+        cols = "(branch, stream, t_date, base, url, info)"
+        arg = cur.mogrify("(%s,%s,%s,%s,%s)",
+                           (row["branch"], pfx, row["date"], row["base"],
+                            row["url"], json.dumps(row)))
+        cur.execute(f"INSERT INTO branches {cols} VALUES " + arg.decode('utf-8'))
 
 
 def generate_deltas(config, tree, name):