diff --git a/src/pyinfra/facts/postgres.py b/src/pyinfra/facts/postgres.py
index 552e8230b..92a4ec303 100644
--- a/src/pyinfra/facts/postgres.py
+++ b/src/pyinfra/facts/postgres.py
@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+import re
+
 from typing_extensions import override
 
 from pyinfra.api import FactBase, HiddenValue, QuoteString, StringCommand
@@ -7,6 +9,20 @@
 
 from .util.databases import parse_columns_and_rows
 
+# PostgreSQL configuration parameter names are identifiers: a letter or underscore
+# followed by letters, digits or underscores, optionally with a single dotted prefix
+# for extension ("custom") parameters such as ``auto_explain.log_min_duration``.
+SETTING_NAME_RE = re.compile(r"^[A-Za-z_][A-Za-z0-9_]*(\.[A-Za-z_][A-Za-z0-9_]*)?$")
+
+
+def quote_sql_literal(value: object) -> str:
+    """
+    Render a value as a single-quoted PostgreSQL string literal, doubling any
+    embedded single quotes to prevent SQL injection.
+    """
+
+    return "'" + str(value).replace("'", "''") + "'"
+
 
 def make_psql_command(
     database: str | None = None,
@@ -182,3 +198,95 @@ def process(self, output):
             databases[details.pop("name")] = details
 
         return databases
+
+
+def _process_settings_row(row: dict[str, str | None]) -> dict[str, str | None]:
+    return {
+        "value": row.get("setting"),
+        "unit": row.get("unit"),
+        "source": row.get("source"),
+        "context": row.get("context"),
+    }
+
+
+class PostgresConfiguration(PostgresFactBase):
+    """
+    Returns a dict of all PostgreSQL run-time configuration settings, as reported
+    by ``pg_settings``:
+
+    .. code:: python
+
+        {
+            "shared_buffers": {
+                "value": "16384",
+                "unit": "8kB",
+                "source": "configuration file",
+                "context": "postmaster",
+            },
+            ...
+        }
+
+    The ``value`` is the *running* value (``pg_settings.setting``), ``source`` is
+    where it came from and ``context`` says how a change takes effect (eg
+    ``postmaster`` needs a restart, ``sighup`` needs a reload).
+    """
+
+    default = dict
+    psql_command = "SELECT name, setting, unit, source, context FROM pg_settings ORDER BY name"
+
+    @override
+    def process(self, output: list[str]) -> dict[str, dict[str, str | None]]:
+        # Remove the last line of the output (row count)
+        output = output[:-1]
+        rows = parse_columns_and_rows(output, "|")
+        return {row.pop("name"): _process_settings_row(row) for row in rows}
+
+
+class PostgresSetting(PostgresFactBase):
+    """
+    Returns a single PostgreSQL configuration setting as reported by
+    ``pg_settings``, or ``None`` when there is no such setting:
+
+    .. code:: python
+
+        {
+            "value": "4096",
+            "unit": "kB",
+            "source": "default",
+            "context": "user",
+        }
+    """
+
+    @override
+    def command(  # type: ignore[override]
+        self,
+        setting: str,
+        psql_user: str | None = None,
+        psql_password: str | None = None,
+        psql_host: str | None = None,
+        psql_port: int | None = None,
+        psql_database: str | None = None,
+    ) -> StringCommand:
+        sql = (
+            "SELECT name, setting, unit, source, context FROM pg_settings WHERE name = "
+            + quote_sql_literal(setting)
+        )
+        return make_execute_psql_command(
+            sql,
+            user=psql_user,
+            password=psql_password,
+            host=psql_host,
+            port=psql_port,
+            database=psql_database,
+        )
+
+    @override
+    def process(self, output: list[str]) -> dict[str, str | None] | None:
+        # Remove the last line of the output (row count)
+        output = output[:-1]
+        rows = parse_columns_and_rows(output, "|")
+        if not rows:
+            return None
+        row = rows[0]
+        row.pop("name")
+        return _process_settings_row(row)
diff --git a/src/pyinfra/operations/postgres.py b/src/pyinfra/operations/postgres.py
index e37f12881..f66ce6773 100644
--- a/src/pyinfra/operations/postgres.py
+++ b/src/pyinfra/operations/postgres.py
@@ -16,13 +16,18 @@
 
 from __future__ import annotations
 
+import re
+
 from pyinfra import host
-from pyinfra.api import HiddenValue, QuoteString, StringCommand, operation
+from pyinfra.api import HiddenValue, OperationError, QuoteString, StringCommand, operation
 from pyinfra.facts.postgres import (
+    SETTING_NAME_RE,
+    PostgresConfiguration,
     PostgresDatabases,
     PostgresRoles,
     make_execute_psql_command,
     make_psql_command,
+    quote_sql_literal,
 )
 
 
@@ -440,3 +445,196 @@ def load(
         "<",
         QuoteString(src),
     )
+
+
+# Multipliers used to normalise PostgreSQL memory/time settings so an operation
+# value such as "128MB" can be compared against the raw value + unit pg_settings
+# reports (eg setting="16384", unit="8kB"). Memory is reduced to bytes and time
+# to microseconds.
+_MEMORY_UNITS = {"b": 1, "kb": 1024, "mb": 1024**2, "gb": 1024**3, "tb": 1024**4}
+_TIME_UNITS = {
+    "us": 1,
+    "ms": 1000,
+    "s": 1_000_000,
+    "min": 60_000_000,
+    "h": 3_600_000_000,
+    "d": 86_400_000_000,
+}
+_UNIT_SCALES = {**_MEMORY_UNITS, **_TIME_UNITS}
+
+_TRUE_VALUES = {"on", "true", "yes", "1"}
+_FALSE_VALUES = {"off", "false", "no", "0"}
+
+# A bare quantity ("128", "2.5") with an optional unit suffix ("128MB", "30s").
+_QUANTITY_RE = re.compile(r"^(-?\d+(?:\.\d+)?)\s*([a-zA-Z]*)$")
+# A pg_settings unit, optionally prefixed with a block multiplier ("8kB", "kB").
+_UNIT_RE = re.compile(r"^(\d*)\s*([a-zA-Z]+)$")
+
+
+def _to_bool(value: str) -> bool | None:
+    lowered = value.strip().lower()
+    if lowered in _TRUE_VALUES:
+        return True
+    if lowered in _FALSE_VALUES:
+        return False
+    return None
+
+
+def _to_number(value: str) -> int | float | None:
+    try:
+        return int(value)
+    except ValueError:
+        try:
+            return float(value)
+        except ValueError:
+            return None
+
+
+def _quantity_match(desired: str, current: str, unit: str) -> bool:
+    unit_match = _UNIT_RE.match(unit)
+    if unit_match is None:
+        return False
+    unit_multiplier = int(unit_match.group(1)) if unit_match.group(1) else 1
+    unit_scale = _UNIT_SCALES.get(unit_match.group(2).lower())
+    if unit_scale is None:
+        return False
+
+    current_number = _to_number(current)
+    if current_number is None:
+        return False
+    current_base = current_number * unit_multiplier * unit_scale
+
+    desired_match = _QUANTITY_RE.match(desired)
+    if desired_match is None:
+        return False
+    desired_number = _to_number(desired_match.group(1))
+    if desired_number is None:
+        return False
+    suffix = desired_match.group(2)
+    if suffix:
+        suffix_scale = _UNIT_SCALES.get(suffix.lower())
+        if suffix_scale is None:
+            return False
+        desired_base = desired_number * suffix_scale
+    else:
+        # A bare number is interpreted as a count in the setting's own unit.
+        desired_base = desired_number * unit_multiplier * unit_scale
+
+    return current_base == desired_base
+
+
+def _values_match(desired: object, current_value: str | None, unit: str | None) -> bool:
+    if current_value is None:
+        return False
+
+    desired_str = str(desired).strip()
+    current_str = current_value.strip()
+    if desired_str == current_str:
+        return True
+
+    if unit:
+        return _quantity_match(desired_str, current_str, unit)
+
+    desired_bool = _to_bool(desired_str)
+    current_bool = _to_bool(current_str)
+    if desired_bool is not None and current_bool is not None:
+        return desired_bool == current_bool
+
+    desired_number = _to_number(desired_str)
+    current_number = _to_number(current_str)
+    if desired_number is not None and current_number is not None:
+        return desired_number == current_number
+
+    return desired_str.lower() == current_str.lower()
+
+
+@operation(
+    idempotent_notice=(
+        "ALTER SYSTEM writes to postgresql.auto.conf; until the server reloads or "
+        "restarts, pg_settings still reports the old value, so this operation will "
+        "re-issue the change on each run until it is applied."
+    ),
+)
+def configuration(
+    setting: str,
+    value: str | int | bool | None = None,
+    present: bool = True,
+    # Details for speaking to PostgreSQL via `psql` CLI
+    psql_user: str | None = None,
+    psql_password: str | None = None,
+    psql_host: str | None = None,
+    psql_port: int | None = None,
+    psql_database: str | None = None,
+):
+    """
+    Set or reset a PostgreSQL server configuration parameter with ``ALTER SYSTEM``.
+
+    + setting: name of the configuration parameter (eg ``work_mem``)
+    + value: desired value, required when ``present`` is ``True``
+    + present: ``True`` to set ``value``, ``False`` to reset the setting to its
+      default with ``ALTER SYSTEM RESET``
+    + psql_*: global module arguments, see above
+
+    Reload/restart:
+        ``ALTER SYSTEM`` only writes ``postgresql.auto.conf``. Changes take effect
+        after the server reloads (``postgres.sql("SELECT pg_reload_conf()")``) or,
+        for settings whose ``context`` is ``postmaster``, after a full restart.
+        This operation never reloads or restarts for you, so it compares against
+        the *running* value and becomes a no-op once the change is live.
+
+    **Example:**
+
+    .. code:: python
+
+        postgres.configuration(
+            name="Increase work_mem",
+            setting="work_mem",
+            value="8MB",
+            _sudo_user="postgres",
+        )
+    """
+
+    if not SETTING_NAME_RE.match(setting):
+        raise OperationError(f"invalid PostgreSQL setting name: {setting}")
+
+    if present and value is None:
+        raise OperationError("`value` is required when `present` is True")
+
+    current = host.get_fact(
+        PostgresConfiguration,
+        psql_user=psql_user,
+        psql_password=psql_password,
+        psql_host=psql_host,
+        psql_port=psql_port,
+        psql_database=psql_database,
+    ).get(setting)
+
+    if not present:
+        if current is None:
+            host.noop(f"postgresql setting {setting} is not set")
+            return
+        if current.get("source") == "default":
+            host.noop(f"postgresql setting {setting} is already at its default")
+            return
+        yield make_execute_psql_command(
+            f"ALTER SYSTEM RESET {setting}",
+            user=psql_user,
+            password=psql_password,
+            host=psql_host,
+            port=psql_port,
+            database=psql_database,
+        )
+        return
+
+    if current is not None and _values_match(value, current.get("value"), current.get("unit")):
+        host.noop(f"postgresql setting {setting} is already set to {value}")
+        return
+
+    yield make_execute_psql_command(
+        f"ALTER SYSTEM SET {setting} = {quote_sql_literal(value)}",
+        user=psql_user,
+        password=psql_password,
+        host=psql_host,
+        port=psql_port,
+        database=psql_database,
+    )
diff --git a/tests/facts/postgres.PostgresConfiguration/custom_connection.yaml b/tests/facts/postgres.PostgresConfiguration/custom_connection.yaml
new file mode 100644
index 000000000..2157f353c
--- /dev/null
+++ b/tests/facts/postgres.PostgresConfiguration/custom_connection.yaml
@@ -0,0 +1,19 @@
+arg:
+  psql_user: myuser
+  psql_password: mypassword
+  psql_host: myhost
+  psql_port: 5432
+command:
+  raw: "PGPASSWORD=mypassword psql -U myuser -h myhost -p 5432 -Ac 'SELECT name, setting, unit, source, context FROM pg_settings ORDER BY name'"
+  masked: "PGPASSWORD='*MASKED*' psql -U myuser -h myhost -p 5432 -Ac 'SELECT name, setting, unit, source, context FROM pg_settings ORDER BY name'"
+requires_command: psql
+output: |
+  name|setting|unit|source|context
+  work_mem|4096|kB|default|user
+  (1 row)
+fact:
+  work_mem:
+    value: "4096"
+    unit: kB
+    source: default
+    context: user
diff --git a/tests/facts/postgres.PostgresConfiguration/settings.yaml b/tests/facts/postgres.PostgresConfiguration/settings.yaml
new file mode 100644
index 000000000..ca89029bb
--- /dev/null
+++ b/tests/facts/postgres.PostgresConfiguration/settings.yaml
@@ -0,0 +1,30 @@
+command: "psql -Ac 'SELECT name, setting, unit, source, context FROM pg_settings ORDER BY name'"
+requires_command: psql
+output: |
+  name|setting|unit|source|context
+  max_connections|100||default|postmaster
+  shared_buffers|16384|8kB|configuration file|postmaster
+  ssl|off||default|postmaster
+  work_mem|4096|kB|default|user
+  (4 rows)
+fact:
+  max_connections:
+    value: "100"
+    unit: null
+    source: default
+    context: postmaster
+  shared_buffers:
+    value: "16384"
+    unit: "8kB"
+    source: configuration file
+    context: postmaster
+  ssl:
+    value: "off"
+    unit: null
+    source: default
+    context: postmaster
+  work_mem:
+    value: "4096"
+    unit: kB
+    source: default
+    context: user
diff --git a/tests/facts/postgres.PostgresSetting/not_found.yaml b/tests/facts/postgres.PostgresSetting/not_found.yaml
new file mode 100644
index 000000000..3d97ba429
--- /dev/null
+++ b/tests/facts/postgres.PostgresSetting/not_found.yaml
@@ -0,0 +1,8 @@
+arg:
+  setting: does_not_exist
+command: "psql -Ac 'SELECT name, setting, unit, source, context FROM pg_settings WHERE name = '\"'\"'does_not_exist'\"'\"''"
+requires_command: psql
+output: |
+  name|setting|unit|source|context
+  (0 rows)
+fact: null
diff --git a/tests/facts/postgres.PostgresSetting/single.yaml b/tests/facts/postgres.PostgresSetting/single.yaml
new file mode 100644
index 000000000..0bb9738d5
--- /dev/null
+++ b/tests/facts/postgres.PostgresSetting/single.yaml
@@ -0,0 +1,13 @@
+arg:
+  setting: work_mem
+command: "psql -Ac 'SELECT name, setting, unit, source, context FROM pg_settings WHERE name = '\"'\"'work_mem'\"'\"''"
+requires_command: psql
+output: |
+  name|setting|unit|source|context
+  work_mem|4096|kB|default|user
+  (1 row)
+fact:
+  value: "4096"
+  unit: kB
+  source: default
+  context: user
diff --git a/tests/operations/postgres.configuration/boolean_change.yaml b/tests/operations/postgres.configuration/boolean_change.yaml
new file mode 100644
index 000000000..523cc64e6
--- /dev/null
+++ b/tests/operations/postgres.configuration/boolean_change.yaml
@@ -0,0 +1,14 @@
+args:
+  - ssl
+kwargs:
+  value: "on"
+facts:
+  postgres.PostgresConfiguration:
+    "psql_database=None, psql_host=None, psql_password=None, psql_port=None, psql_user=None":
+      ssl:
+        value: "off"
+        unit: null
+        source: default
+        context: postmaster
+commands:
+  - "psql -Ac 'ALTER SYSTEM SET ssl = '\"'\"'on'\"'\"''"
diff --git a/tests/operations/postgres.configuration/boolean_match_noop.yaml b/tests/operations/postgres.configuration/boolean_match_noop.yaml
new file mode 100644
index 000000000..5c04fa142
--- /dev/null
+++ b/tests/operations/postgres.configuration/boolean_match_noop.yaml
@@ -0,0 +1,14 @@
+args:
+  - ssl
+kwargs:
+  value: true
+facts:
+  postgres.PostgresConfiguration:
+    "psql_database=None, psql_host=None, psql_password=None, psql_port=None, psql_user=None":
+      ssl:
+        value: "on"
+        unit: null
+        source: configuration file
+        context: postmaster
+commands: []
+noop_description: "postgresql setting ssl is already set to True"
diff --git a/tests/operations/postgres.configuration/invalid_name.yaml b/tests/operations/postgres.configuration/invalid_name.yaml
new file mode 100644
index 000000000..2038cac7b
--- /dev/null
+++ b/tests/operations/postgres.configuration/invalid_name.yaml
@@ -0,0 +1,7 @@
+args:
+  - "work_mem = 0; DROP DATABASE prod"
+kwargs:
+  value: "8MB"
+exception:
+  name: OperationError
+  message: "invalid PostgreSQL setting name: work_mem = 0; DROP DATABASE prod"
diff --git a/tests/operations/postgres.configuration/memory_block_match_noop.yaml b/tests/operations/postgres.configuration/memory_block_match_noop.yaml
new file mode 100644
index 000000000..1248e2b63
--- /dev/null
+++ b/tests/operations/postgres.configuration/memory_block_match_noop.yaml
@@ -0,0 +1,14 @@
+args:
+  - shared_buffers
+kwargs:
+  value: "128MB"
+facts:
+  postgres.PostgresConfiguration:
+    "psql_database=None, psql_host=None, psql_password=None, psql_port=None, psql_user=None":
+      shared_buffers:
+        value: "16384"
+        unit: "8kB"
+        source: configuration file
+        context: postmaster
+commands: []
+noop_description: "postgresql setting shared_buffers is already set to 128MB"
diff --git a/tests/operations/postgres.configuration/memory_change.yaml b/tests/operations/postgres.configuration/memory_change.yaml
new file mode 100644
index 000000000..c85a64535
--- /dev/null
+++ b/tests/operations/postgres.configuration/memory_change.yaml
@@ -0,0 +1,14 @@
+args:
+  - shared_buffers
+kwargs:
+  value: "256MB"
+facts:
+  postgres.PostgresConfiguration:
+    "psql_database=None, psql_host=None, psql_password=None, psql_port=None, psql_user=None":
+      shared_buffers:
+        value: "16384"
+        unit: "8kB"
+        source: configuration file
+        context: postmaster
+commands:
+  - "psql -Ac 'ALTER SYSTEM SET shared_buffers = '\"'\"'256MB'\"'\"''"
diff --git a/tests/operations/postgres.configuration/missing_value.yaml b/tests/operations/postgres.configuration/missing_value.yaml
new file mode 100644
index 000000000..1f0e7ac6f
--- /dev/null
+++ b/tests/operations/postgres.configuration/missing_value.yaml
@@ -0,0 +1,5 @@
+args:
+  - work_mem
+exception:
+  name: OperationError
+  message: "`value` is required when `present` is True"
diff --git a/tests/operations/postgres.configuration/number_match_noop.yaml b/tests/operations/postgres.configuration/number_match_noop.yaml
new file mode 100644
index 000000000..00b8cf272
--- /dev/null
+++ b/tests/operations/postgres.configuration/number_match_noop.yaml
@@ -0,0 +1,14 @@
+args:
+  - seq_page_cost
+kwargs:
+  value: "1.0"
+facts:
+  postgres.PostgresConfiguration:
+    "psql_database=None, psql_host=None, psql_password=None, psql_port=None, psql_user=None":
+      seq_page_cost:
+        value: "1"
+        unit: null
+        source: default
+        context: user
+commands: []
+noop_description: "postgresql setting seq_page_cost is already set to 1.0"
diff --git a/tests/operations/postgres.configuration/reset.yaml b/tests/operations/postgres.configuration/reset.yaml
new file mode 100644
index 000000000..cf1d7f1f5
--- /dev/null
+++ b/tests/operations/postgres.configuration/reset.yaml
@@ -0,0 +1,14 @@
+args:
+  - work_mem
+kwargs:
+  present: false
+facts:
+  postgres.PostgresConfiguration:
+    "psql_database=None, psql_host=None, psql_password=None, psql_port=None, psql_user=None":
+      work_mem:
+        value: "8192"
+        unit: kB
+        source: configuration file
+        context: user
+commands:
+  - "psql -Ac 'ALTER SYSTEM RESET work_mem'"
diff --git a/tests/operations/postgres.configuration/reset_absent_noop.yaml b/tests/operations/postgres.configuration/reset_absent_noop.yaml
new file mode 100644
index 000000000..c25e18728
--- /dev/null
+++ b/tests/operations/postgres.configuration/reset_absent_noop.yaml
@@ -0,0 +1,9 @@
+args:
+  - some_custom.guc
+kwargs:
+  present: false
+facts:
+  postgres.PostgresConfiguration:
+    "psql_database=None, psql_host=None, psql_password=None, psql_port=None, psql_user=None": {}
+commands: []
+noop_description: "postgresql setting some_custom.guc is not set"
diff --git a/tests/operations/postgres.configuration/reset_default_noop.yaml b/tests/operations/postgres.configuration/reset_default_noop.yaml
new file mode 100644
index 000000000..9aff918fa
--- /dev/null
+++ b/tests/operations/postgres.configuration/reset_default_noop.yaml
@@ -0,0 +1,14 @@
+args:
+  - work_mem
+kwargs:
+  present: false
+facts:
+  postgres.PostgresConfiguration:
+    "psql_database=None, psql_host=None, psql_password=None, psql_port=None, psql_user=None":
+      work_mem:
+        value: "4096"
+        unit: kB
+        source: default
+        context: user
+commands: []
+noop_description: "postgresql setting work_mem is already at its default"
diff --git a/tests/operations/postgres.configuration/set_custom_connection.yaml b/tests/operations/postgres.configuration/set_custom_connection.yaml
new file mode 100644
index 000000000..2799c277b
--- /dev/null
+++ b/tests/operations/postgres.configuration/set_custom_connection.yaml
@@ -0,0 +1,19 @@
+args:
+  - work_mem
+kwargs:
+  value: "8MB"
+  psql_user: myuser
+  psql_password: mypassword
+  psql_host: myhost
+  psql_port: 5432
+facts:
+  postgres.PostgresConfiguration:
+    "psql_database=None, psql_host=myhost, psql_password=mypassword, psql_port=5432, psql_user=myuser":
+      work_mem:
+        value: "4096"
+        unit: kB
+        source: default
+        context: user
+commands:
+  - raw: "PGPASSWORD=mypassword psql -U myuser -h myhost -p 5432 -Ac 'ALTER SYSTEM SET work_mem = '\"'\"'8MB'\"'\"''"
+    masked: "PGPASSWORD='*MASKED*' psql -U myuser -h myhost -p 5432 -Ac 'ALTER SYSTEM SET work_mem = '\"'\"'8MB'\"'\"''"
diff --git a/tests/operations/postgres.configuration/set_new.yaml b/tests/operations/postgres.configuration/set_new.yaml
new file mode 100644
index 000000000..69c91102e
--- /dev/null
+++ b/tests/operations/postgres.configuration/set_new.yaml
@@ -0,0 +1,14 @@
+args:
+  - work_mem
+kwargs:
+  value: "8MB"
+facts:
+  postgres.PostgresConfiguration:
+    "psql_database=None, psql_host=None, psql_password=None, psql_port=None, psql_user=None":
+      work_mem:
+        value: "4096"
+        unit: kB
+        source: default
+        context: user
+commands:
+  - "psql -Ac 'ALTER SYSTEM SET work_mem = '\"'\"'8MB'\"'\"''"
diff --git a/tests/operations/postgres.configuration/set_unchanged_noop.yaml b/tests/operations/postgres.configuration/set_unchanged_noop.yaml
new file mode 100644
index 000000000..bc7824cca
--- /dev/null
+++ b/tests/operations/postgres.configuration/set_unchanged_noop.yaml
@@ -0,0 +1,14 @@
+args:
+  - work_mem
+kwargs:
+  value: "4MB"
+facts:
+  postgres.PostgresConfiguration:
+    "psql_database=None, psql_host=None, psql_password=None, psql_port=None, psql_user=None":
+      work_mem:
+        value: "4096"
+        unit: kB
+        source: configuration file
+        context: user
+commands: []
+noop_description: "postgresql setting work_mem is already set to 4MB"
diff --git a/tests/operations/postgres.configuration/set_value_with_quote.yaml b/tests/operations/postgres.configuration/set_value_with_quote.yaml
new file mode 100644
index 000000000..da3a93bb2
--- /dev/null
+++ b/tests/operations/postgres.configuration/set_value_with_quote.yaml
@@ -0,0 +1,14 @@
+args:
+  - search_path
+kwargs:
+  value: "a'b"
+facts:
+  postgres.PostgresConfiguration:
+    "psql_database=None, psql_host=None, psql_password=None, psql_port=None, psql_user=None":
+      search_path:
+        value: "\"$user\", public"
+        unit: null
+        source: default
+        context: user
+commands:
+  - "psql -Ac 'ALTER SYSTEM SET search_path = '\"'\"'a'\"'\"''\"'\"'b'\"'\"''"
diff --git a/tests/operations/postgres.configuration/time_match_noop.yaml b/tests/operations/postgres.configuration/time_match_noop.yaml
new file mode 100644
index 000000000..8453dc7cc
--- /dev/null
+++ b/tests/operations/postgres.configuration/time_match_noop.yaml
@@ -0,0 +1,14 @@
+args:
+  - idle_in_transaction_session_timeout
+kwargs:
+  value: "30s"
+facts:
+  postgres.PostgresConfiguration:
+    "psql_database=None, psql_host=None, psql_password=None, psql_port=None, psql_user=None":
+      idle_in_transaction_session_timeout:
+        value: "30000"
+        unit: ms
+        source: configuration file
+        context: user
+commands: []
+noop_description: "postgresql setting idle_in_transaction_session_timeout is already set to 30s"
diff --git a/tests/operations/postgres.configuration/unknown_setting_sets.yaml b/tests/operations/postgres.configuration/unknown_setting_sets.yaml
new file mode 100644
index 000000000..79e4221f0
--- /dev/null
+++ b/tests/operations/postgres.configuration/unknown_setting_sets.yaml
@@ -0,0 +1,9 @@
+args:
+  - auto_explain.log_min_duration
+kwargs:
+  value: "100"
+facts:
+  postgres.PostgresConfiguration:
+    "psql_database=None, psql_host=None, psql_password=None, psql_port=None, psql_user=None": {}
+commands:
+  - "psql -Ac 'ALTER SYSTEM SET auto_explain.log_min_duration = '\"'\"'100'\"'\"''"